Question

If the sum of n terms of an AP is represented by 6n-n^2, then the 10th term is ??​

Answer 1

Step-by-step explanation:

let n=1

Sn =6n-n^2

S1=6(1)-1^2

=6-1

=5

let n=2

Sn=6n-n^2

S2=6(2)-(2)^2

=12-4

=8

since,a1 =S1

therefore a1 =5

a2=S2-S1

=8-5

=3

d=a2-a1

=3-5

=-2

a10 = a+(n-1)d

=5+(10-1)(-2)

=5+9(-2)

=5-18

=-13

Answer 2

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