9, 16, 23.......... 284 is an arithmetic progression. Find the number of terms in this AP.
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An = 284 , a= 9 ,d = 16-9 = 7
An =a+(n-1)d = 9+(n-1) ×7
284 = 9+7n-7
282 = 7n
n = 282/7 it is not possible
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