Q. 6 A5.0( 1 Vote )

# The expressions f

Sn = n2 + 2n

an + 1 = Sn + 1 - Sn

= {(n + 1)2 + 2(n + 1)}-{n2 + 2n}

= n2 + 4n + 4-n2-2n

= 2n + 4

= 2(n + 1) + 2

an = 2n + 2

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