Question

Pls answer this guy's it's a neccesary ​

Answer 1

Answer:

Sn = 4n - n ^2

1) so , S1 = a1 = 4 - 1 = 3

, S2 = a1 + a2 = 8 - 4 = 4

2) so , a2 = 4 - 3 = 1

so , d = 1 - 3 = -2

3)so , a3 = a1 + 2d = -1

4)so , a10 = a1 + 9d = -15

5)so , a.n = 3 + (n-1)-2

= 3 -2n +2

= 5 - 2n

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