Math, asked by mayuresh6299, 10 months ago

If a=22,d=_4 & Sn=64 find n

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Answered by RishiAEC

2

Answer:

4. Sn=64. =>n/2{2a + (n-1_d} = 64. => n/2 {2*22 +(n-1) * (-4)} = 64. => n/2{44 - 4n +4} = 64. => n*4{11-n+1} = 64*2. => 11n - n sq.

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