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If sum of first k terms of an AP is 2k^2-3k, then what is its second term?

Posted by Radhika Singh 5 years, 5 months ago

CBSE > Class 10 > Mathematics

2 answers

Study Lover ?‍? ?‍? 5 years, 5 months ago

Sum of first k term=2k^2-3k Sum of first(k-1) term=2(k-1)^2-3(k-1) =>2(k^2+1-2k)-3k+3 =>2k^2+2-4k-3k+3 =>2k^2+5-7k.. K th term=2k^2-3k-2k^2-5+7k =>4k-5.. 2nd term of AP=4×2-5=3.

2Thank You

Radhika Singh 5 years, 5 months ago

Please solve fast?

1Thank You

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