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If ‘a’ is a natural number, then (7a^2+7...

If ‘a’ is a natural number, then `(7a^2+7a)` is always divisible by:
अगर एक प्राकृतिक संख्या है ,तो `(7a^2+7a)` हमेशा विभाजित होगी :

A

7 and 14 both

B

7 only

C

14 only

D

21only

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