each of the numbers from 1 to 50 is written on a tile and the tiles are placed upside down on the top of the table. if a tile is picked up at random, what is the probability that the number on the tile is multiple of 7 or a multiple of 8?

Question

anonymous · Answer

i get 13/50 by counting

anonymous · Answer

probably wrong though because i don't know my times tables.

anonymous · Answer

7C1/50C1+6C1/50C1

anonymous · Answer

???

anonymous · Answer

7, 14, 21, 28, 35, 42, 49 are the multiples of 7
8, 16, 24, 42, 40, 48 are the multiples of 8.  i get a total of 13 so it is 
$$\frac{13}{50}$$

amistre64 · Answer

42 is doubled

amistre64 · Answer

.....well, 42 = 32 tho ;)

anonymous · Answer

well sat i also got ur answer only 7/50+6/50=13/50

amistre64 · Answer

the addition rule yes; P(AorB) = P(A) + P(B) - P(AandB)

anonymous · Answer

yeah brackett i saw that you were right after i put my answer.  i did think it was an odd method howewver

anonymous · Answer

yeah, for "42" read "32"  you would have to look for double entries but 8*7 is bigger than 50