ItoSneranclpiek ItoSneranclpiek

13-09-2016
Mathematics

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how many term are there in A.P 201,208,215...........369

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nobillionaireNobley nobillionaireNobley

13-09-2016

Last term = 369
First tern (a) = 201
common difference = 208 - 201 = 7

Last term = a + (n - 1)d
369 = 201 + (n - 1) x 7 = 201 + 7n - 7 = 194 + 7n
7n = 369 - 194 = 175
n = 175/7 = 25

The A.P. has 25 terms

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