A box contains 90 discs which are numbered from 1 to 90. If one disc i

1.	A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears(a)A two-digit number (b) a number divisible by 5
Answer» Total number of discs in the box = 90 (a) Two digit numbers from 1 to 90 = 81 P(getting a two-digit number) = 81/90 = 9/10 (b) Numbers divisible by 5 from 1 to 90 = 5, 10, …. , 90, Total numbers = 18 P(getting a number which is divisible by 5) = 18/90 = 1/5

A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears(a)A two-digit number (b) a number divisible by 5

Answer»

Total number of discs in the box = 90

(a) Two digit numbers from 1 to 90 = 81

P(getting a two-digit number) = 81/90 = 9/10

(b) Numbers divisible by 5 from 1 to 90 = 5, 10, …. , 90,

Total numbers = 18

P(getting a number which is divisible by 5) = 18/90 = 1/5

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A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears(a)A two-digit number (b) a number divisible by 5

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