1. If the 3rd and the 5th term of an arithmetic progression are 13 and 21, what is the 13th term?





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  • By: anil on 05 May 2019 01.45 am
    $$T_{3}$$ = a + 2d = 13-------(1) $$T_{5}$$ = a + 4d = 21-------(2) on solving (1) AND (2) d = 4 & a = 5 $$T_{13}$$ = a + 12d = 5 + 12(4) = 5 + 48 = 53
    So the answer is option A.
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