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If 1, A1 , A2 , A3 , .... An , 31 are in A. P. and A7 : An-1 = 5 : 9 then n =______

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If 1, A1 , A2 , A3 , .... An , 31 are in A. P. and A7 : An-1 = 5 : 9 then n =______ 

(A) 28 

(B) 14 

(C) 15 

(D) 13

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The correct option is (B) 14.

Explanation:

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