Math, asked by ramilavadaliya39308, 7 months ago

in a.p. Sn=n²-n so what's a9=?

Answers

Answered by govindach91

1

Step-by-step explanation:

Sn=n^2-n

S9=9^2-9=72

now,

S9-S8=a9

72-56=a9

so,a9=16

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