Question

Consider all prime numbers between 1 and 100. Which of the following statements is (are) correct?
a. A number that is one greater than a multiple of 5 has a unit digit 3 or 6.
b. The sum of all numbers which are one greater than a multiple of 5 is 215.
c. The sum of all numbers which are one greater than a multiple of 5 and also one     greater than a multiple of 6 is 92.

A b and c
B a and c
C b only
D a and b
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