How many terms are there in the A.P. 
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We know, an = a + (n – 1)d where a is first term or a1 and d is common difference and n is any natural number
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To find total terms of the A.P., put a_n
is last term of A.P.
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⇒ n = 27
Hence, there are total 27 terms in the given A.P.