A) one
B) two
C) three
D) none of these
Correct Answer: A
Solution :
(a): Only solution is a = 3 \[\Rightarrow \]3, 5, 7 are prime numbers. After this same of such nos. become multiplied of these very prime nos. Eg: 5, 7, 9 (9 is a multiple of 3) 11, 13, 15 (15 is a multiple of 3).
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