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If 7th and 13th terms of an A.P. be 3...

If 7th and 13th terms of an A.P. be 34 and 64 respectively, then its 18th term is (a) 87 (b) 88 (c) 89 (d) 90

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The correct Answer is:
89
a+6d =34 ` " " (i) " " and " " a+12d =64`
On solving (i) and (ii), we get a=4 and d=5
` T_(180 =a +17d = ( 4+17 xx5) =89`
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