http://www.stampcollectioninfo.com/blocks-white/
What is the probability of the white blocks?
Here is the problem:
A box contains several blocks of 3 different colors. Purple, gold and white. The probability of the purple blocks from the box is 1/4 and the probablity of the gold blocks from the box is 3/8. What is the probablity of the white blocks?
Help.
What is the fewest number of blocks that could be in the box?
1 - (1/4 + 3/8) = 3/8
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 SET OF 4 PRESIDENTIAL SERIES PLATE BLOCKS JEFFERSON MADISON WHITE HOUSE MONROE $7.95 Time Remaining: 1h 50m |
 Scott 1338 US Stamp 1968 6c Flag and White House Zip Block of 4 UR MNH su024 $1.50 Time Remaining: 2h 20m |
 Scott 1338 US Stamp 1968 6c Flag and White House Zip Block of 4 LR MNH su077 $1.50 Time Remaining: 2h 22m |
 Scott 1338 US Stamp 1968 6c Flag and White House Plate Block of 4 LR29624 st223 $1.50 Time Remaining: 2h 23m |
 Scott 1338 US Stamp 1968 6c Flag and White House Plate Block of 4 UL29616 st216 $1.50 Time Remaining: 3h 32m |
 US Plate BLock 4 1963 1208 5c Flag White House MNH $1.00 Time Remaining: 6h 24m Buy It Now for only: $1.00 |
 3345 MVFNH OG plate block of 4 White House $1.75 Time Remaining: 16h 8m |
 960 1948 3 cent William Allen White block of 4 MNH w plt $0.50 Time Remaining: 1d 2h |
 52c Hubert Humphrey 4c Father Flanagan 3c Paul D White MD Blocks of 6 4 $0.99 Time Remaining: 1d 5h 4m |
 THE WHITE HOUSE 1950 Scott 990 BLOCK OF 12 $2.99 Time Remaining: 1d 6h 7m |
 1963 FLAG WHITE HOUSE 1208 Mint MNH Plate Block $1.20 Time Remaining: 1d 16h 36m Buy It Now for only: $1.20 |
 1950 THE WHITE HOUSE 990 Mint MNH Plate Block $1.10 Time Remaining: 2d 15m Buy It Now for only: $1.10 |
 US 1948 Plate BLock 3c William A White writer 960 $1.30 Time Remaining: 2d 8h 30m Buy It Now for only: $1.30 |
 US Plate BLock 4 1968 1338 6c Flag White House MNH UR $1.00 Time Remaining: 2d 9h 40m Buy It Now for only: $1.00 |
 1962s 1208 Flag over White House Mint Block of 4 Never Hinged $1.00 Time Remaining: 2d 16h 40m Buy It Now for only: $1.25 |
 Vintage 1977 78 White Ace Album Plus US Stamps Blocks 72 Face Value $79.00 Time Remaining: 2d 19h 13m |
 SC 1338D MNH 06 Flag White House Plate Block of 20 $2.99 Time Remaining: 2d 19h 22m Buy It Now for only: $5.99 |
 SC 931 MNH 02 Roosevelt Little White House Plate Block of 4 $1.99 Time Remaining: 2d 19h 24m Buy It Now for only: $3.99 |
 RW 36 White einged Scoter Plate Block MNH $75.00 Time Remaining: 2d 22h 59m Buy It Now for only: $85.00 |
 809 80 Sudduth Block of 4 4 1 2c White House EE Prexy Issue $15.00 Time Remaining: 2d 23h 38m Buy It Now for only: $15.00 |
 2170 1986 3 cent Dr Paul Dudley White block of 4 MNH w plt $0.50 Time Remaining: 3d 1h 27m |
 1338 Block of 4 Flag over White House Stamp $1.20 Time Remaining: 3d 2h 16m Buy It Now for only: $1.20 |
 FULL MINT PLATE BLOCK 16 WHITE OAK 15 CENT US STAMPS $2.95 Time Remaining: 3d 3h 8m |
 629 SCARCE 2c WHITE PLAINS GORGEOUS MNH PLATE BLOCK OF 6 $37.99 Time Remaining: 3d 4h 3m Buy It Now for only: $41.99 |
 US Plate Block of 4 Scott 960 MNH William Allen White 1948 $1.69 Time Remaining: 3d 7h 12m Buy It Now for only: $2.19 |
 US Plate Block of 4 Scott 990 MNH White House 1950 $1.19 Time Remaining: 3d 7h 14m Buy It Now for only: $1.69 |
 US Plate Block of 4 Scott 932 MNH Roosevelt White House 1945 $0.99 Time Remaining: 3d 7h 25m Buy It Now for only: $1.49 |
 Scott 3445 33 Cent The White House SA Plate Block MNH $4.75 Time Remaining: 3d 16h 30m Buy It Now for only: $4.75 |
 WHITE HOUSE 1800 1950 GORGEOUS CACHET STAMP PLATE BLOCK 1950 FDC $0.99 Time Remaining: 3d 23h 22m |
 1338 1968 6 cent Flag over White House block of 4 MNH w plt $0.50 Time Remaining: 4d 10m |
 US1945 FD ROOSEVELT Sc 932 MNH plate block of 4 WHITE HOUSE WASHINGTON DC $0.99 Time Remaining: 4d 2h 48m |
 4398 WHITE ROSE WEDDING CAKE PLATE BLOCK MINT NH $4.15 Time Remaining: 4d 6h 22m Buy It Now for only: $4.15 |
 Unused 1948 William Allen White Plate Block Scott 960 2037 25 $1.99 Time Remaining: 4d 20h 40m Buy It Now for only: $1.99 |
 Unused 1945 FDR Little White House Plate Block Scott 931 2037 21 $1.99 Time Remaining: 4d 20h 42m Buy It Now for only: $1.99 |
 nystamps P Mint Old US Stamp Plate Block Collection White Ace Album $44.54 (3 Bids) Time Remaining: 4d 22h 54m |
 nystamps P Mint Old US Stamp Plate Block Collection White Ace Album Page $56.00 (2 Bids) Time Remaining: 4d 23h 3m |
 nystamps P Mint US National Park Stamp Plate Block Collection White Ace Album Pa $21.50 (4 Bids) Time Remaining: 4d 23h 23m |
 960 VAR WILLIAM ALLEN WHITE BLOCK OF 4 MISPERF ERROR BN2284 $75.00 Time Remaining: 5d 13h 59m Buy It Now for only: $75.00 |
 Scott 960 William Allen White Plate Block of 4 Mint NH OG F VF $0.99 Time Remaining: 5d 17h 38m |
 FDC Scott 1338F 8c Flag White House Block of 4 ArtCraft Cachet 4 Stamps $1.99 Time Remaining: 5d 17h 46m Buy It Now for only: $1.99 |
 JAMES HOBAN 1936 WHITE HOUSE ARCHITECT BLOCK OF 4 FIRST DAY COVER CACHET FDC $1.99 Time Remaining: 5d 19h 12m Buy It Now for only: $1.99 |
 Texas 1973 White Wing Dove Conservation block of 10 $20.00 Time Remaining: 5d 19h 29m Buy It Now for only: $20.00 |
 Scotts 953 Plate Block 20 W 8 Stamps Light to Heavy Printing White Streaks $59.95 Time Remaining: 5d 19h 37m Buy It Now for only: $59.95 |
 Stamps US Flag and White House Sc1338F 8Cnts MNH Block $4.70 Time Remaining: 5d 21h 31m Buy It Now for only: $4.70 |
 1968 Sc 1338 IMPERF Flag White House plate block of 4 $32.50 Time Remaining: 5d 23h 37m Buy It Now for only: $32.50 |
 960 FIRST DAY COVER ARTCRAFT WILLIAM ALLEN WHITE BLOCK OF 4 $0.10 Time Remaining: 5d 23h 47m |
 25+ Used Average+ 5c Scott 1208 Flag Over White House Blocks $1.00 Time Remaining: 6d 2h 18m Buy It Now for only: $1.00 |
 20 Used Average+ 6c Scott 1338 Flag and White House Blocks $1.00 Time Remaining: 6d 2h 19m Buy It Now for only: $1.00 |
 WHITE ACE ALBUM WITH US PLATE BLOCKS 1948 1960 COMMEMORATIVES M NM 104 PAGES $0.99 Time Remaining: 6d 4h 17m |
 US MNH Plate block collection in White Ace album with slip cover 1976 to 1980 $20.70 (5 Bids) Time Remaining: 6d 4h 31m |