Question

Sum of first 10 terms of an arithmetic sequence is 350. Sum of first 15 terms is 750 Find 8th term of the sequence Find sum of 3rd term and 10th term Find first term and common difference

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Answer 1

Answer:

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Explanation:

Answer 2

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Sn=2n[2a+(n−1)d]

Sn=2n[2a+(n−1)d]750=215[2(15)+(15−1)d]

Sn=2n[2a+(n−1)d]750=215[2(15)+(15−1)d]100=30+14d

Sn=2n[2a+(n−1)d]750=215[2(15)+(15−1)d]100=30+14d∴d=1470=5

Sn=2n[2a+(n−1)d]750=215[2(15)+(15−1)d]100=30+14d∴d=1470=5Tn=a+(n−1)d

Sn=2n[2a+(n−1)d]750=215[2(15)+(15−1)d]100=30+14d∴d=1470=5Tn=a+(n−1)dT20=15+(20−1)5

Sn=2n[2a+(n−1)d]750=215[2(15)+(15−1)d]100=30+14d∴d=1470=5Tn=a+(n−1)dT20=15+(20−1)5=15+95

Sn=2n[2a+(n−1)d]750=215[2(15)+(15−1)d]100=30+14d∴d=1470=5Tn=a+(n−1)dT20=15+(20−1)5=15+95∴T20=110