Math, asked by seemamorehtk, 7 months ago

write the first term a & the common difference d of AP , -1.1 , -3.1 , -5.1 ,-7.1,.......

Answers

Answered by Anonymous

12

Sum of first n terms Sn=n/2[2a+(n-1)*d]

n/2[2×8+(n-1)×20]=2n/2[2×-30+(2n-1)×8]

16+20n-20=2(-60+16n-8)

-4+20n=2(-68+16n)

-2+10n=-68+16n

66=6n

n=11

Answered by Anonymous

2

Step-by-step explanation:

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