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Find the sum of following A.P …

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Find the sum of following A.P (I)2,7,12,...........,to 10 terms

    • Posted by Yashwant Yadav 5 years, 3 months ago

    CBSE > Class 10 > Mathematics
    • 4 answers

    Yashwant Yadav 5 years, 1 month ago

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    Adarsh Awasthi 5 years, 3 months ago

    a=2,,,,,,,,,,,, d=5 ..................................... l=a+(n-1) d ====....... 2+(10-1) 5======= .. 2+9×5====....2+45=47 .,...................................... Sn=n/2×(a+l) ====10/2*[2+47]========5*49=====245

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    Aastha Malik 5 years, 2 months ago

    Common difference =7-2=5 First term(a)=2 An=10 S=n/2[2a+(n-1)d S=10/2{2(2)+(10- 1)5 S=5{4+9(5)} S=5{4+45} S=5(49) S=245

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    Ranapratap Pande 5 years, 3 months ago

    a=2 d =5 n=10 Sn=? Sn=n/2 [2a+(n-1)*d] Sn=10/2[2*2+(10-1)*5)] Sn=5[4+9*5] Sn=5[4+45] Sn=5[49] Sn=245.

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