Q. 6 C5.0( 2 Votes )

# The expressions f

Sn = n2 – 2n

an + 1 = Sn + 1-Sn

= {(n + 1)2-2(n + 1)}- (n2 – 2n)

= n2 + 2n + 1-2n-2-n2 + 2n

= 2n-1

= 2(n + 1)-3

an = 2n-3

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