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If the nth term of an …

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If the nth term of an AP is given by a n=2n-1, then sum of its 15 terms is

    • Posted by ****0779 1 year, 1 month ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Shiv Shankar Kumar 1 year, 1 month ago

    Tn=2n-1 :T1=2×1-1=1 :T2=2×2-1=3 :common difference=d=T2-T1=3-1=2 Tn=a+(n-1)d :T1=a+(1-1)2=1 :a+0=1 :a=1 :Sn=n÷2[2a+(n-1)d] S15=15÷2[2×1+14×2] :=15÷2×30 =15×15=225

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