mau5 wrote:

emmak wrote:

What is the probability that a three digit number is divisible by 7?

A. 1/7

B. 127/900

C. 32/225

D. 129/900

E. 1/8

All 3 digit numbers are numbers from 100 to 999 or total 900 numbers [(999-100)+1]

In one set of 100, we have 14 multiples of 7 (14*7=98) Remember we are leaving the 2 left in each 100 for now.

or, in 9 sets of 100 we will have 9*14 =126 multiples of 7

in 9 sets of 100 those 2 left earlier will become 9*2 =18, we get two multiples of 7 from here.

Total multiples = 126 +2 = 128

Probability= 128/900 =64/450=32/225

Answer C

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