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3 yr ago, the average age of a family of...

3 yr ago, the average age of a family of 5 members was 17 yr. A baby having been born, the average age of the family is same today. The present age of the baby is

A

(a)`1 yr`

B

(b)`1frac(1)(2)yr`

C

(c)`2 yr`

D

(d)`3 yr`

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