The sum first n terms of an Ap is n2+n.find the nth term of the series
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Answer:
an = 2(3-n)
Step-by-step explanation:
Sn = 2n +2
S1 = 2+2
= 4 = a1
S2 = 4+2
=6
S2 - a1 = a2
6-4 = 2 = a2
d = -2
an = a +(n-1)d
= 4+ -2(n-1)
= 4 -2n +2
= 6-2n
= 2(3-n)
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