Posted by peter on Thursday, December 19, 2013 at 12:54pm.
A twodigit 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 twodigit numbers that are multiples of 7.
There are 89 twodigit numbers (1099).
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

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

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