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If the" n"th term of an …

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If the" n"th term of an AP is (2n+1) then find sum of first" n" term of the AP

    • Posted by Abhishek Rajput 6 years, 1 month ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Santosh Kumar Gaur 6 years, 1 month ago

    Put n=1 2*1+1=3 This implies a=3 Put n=2 2*2+1=5 a'=5 So, d=a'-a=5-3 d=2 Sum=n/2(2a+(n-1)d) Substitute the values n/2(2*3+(n-1)2) n/2*2(3+n-1) n(n+2) Answer::---n(n+2)

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