Let a1, a2, a3, ....an,.........be in A...

Let `a_1, a_2, a_3, ....a_n,.........`be in A.P. If `a_3 + a_7 + a_11 + a_15 = 72,` then the sum of itsfirst 17 terms is equal to :

306

204

153

612

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