Question

the sum of first n terms of an ap whose first term is 8 and the common difference is 20 is equal to the sum of first 2n terms of an ap whose first term is -30 and common difference is 8 find n​

Answer 1

Answer:

Step-by-step explanation:

the sum of first n terms of an ap whose first term is 8 and the common difference is 20 is equal to the sum of first 2n terms of an ap whose first term is -30 and common difference is 8 find n​

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Answer 2

Answer:11

Step-by-step explanation:

Sum of n terms= Sum of 2n terms

n/2(2a+(n-1)d)=2n/2(2a+(2n-1)d)

n/2(16+(n-1)20)=n(-60+(2n-1)8)

n=11