Question

If the nth term of AP is 2n+1. Find the sum of its fourth and fifth term???

Answer 1

$a4 \: = 2(4) + 1 \\ = 9\\ \\ a5 = 2(5) + 1 \\ = 11 \\ a4 + a5 = 9 + 11 \\ = 20$
Therefore the answer is 20

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