Posted by **peter** on Thursday, December 19, 2013 at 12:54pm.

A two-digit number is chosen at random.What is the probability that the chosen number is a multiple of 7 ?

please answer and explain

- math -
**PsyDAG**, Thursday, December 19, 2013 at 1:15pm
14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91 and 98 are two-digit numbers that are multiples of 7.

There are 89 two-digit numbers (10-99).

13/89 = ?

- math -
**peter**, Thursday, December 19, 2013 at 1:25pm
But the answer is

a. 1/10

b. 1/9

c. 11/90

d. 12/90

e. 13/90

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**peter**, Thursday, December 19, 2013 at 1:26pm
I think is answer e

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**PsyDAG**, Thursday, December 19, 2013 at 1:30pm
You are right. I forgot to include the 10 in the range.

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