math
posted by peter .
A twodigit number is chosen at random.What is the probability that the chosen number is a multiple of 7 ?
please answer and explain

14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91 and 98 are twodigit numbers that are multiples of 7.
There are 89 twodigit numbers (1099).
13/89 = ? 
But the answer is
a. 1/10
b. 1/9
c. 11/90
d. 12/90
e. 13/90 
I think is answer e

You are right. I forgot to include the 10 in the range.