Question

The nth term of the series 3+7+13+21+...is
a) 4n-1 b) n2+2n c) n2 +n+1 d) n2+2​

Answer 1

IN THE QUESTION:-

a=3 ; d = 7 — 3 = 4 ; n=n

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$\large{ \bold{ {n}^{th} \: TERM \: OF \: AN \: AP \: IS \: :-}}$

==>a+(n-1)*d

==>3+(n-1)*4

==>3+4n-5

==>-2+4n

==>4n-2 is the answer