Question

The sum of first n terms of sequence is (n²+5n),where n
is natural number. Find the first 4th term of the sequence.
and also 10th term.

Answer 1

$sn = n { }^{2} + 5n \\ a4 = s4 - s3 \\ a4 =( 16 + 20) - (9 + 15) \\ a4 = 36 - 24 \\ a4 = 12 \\ similarly \: a10 = 24$

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