9^ + 11^ +13^ .....................to n terms pls answer quickly friends
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the question is :- 9+11+12...... to n terms.
Answer :- a=9 ;d=11-9=2 ;
Sn = n÷2{2a+(n-1)d}.
=n÷2{2(9)+(n-1)2}
=n÷2{18+2n-2}
=n÷2{16+2n}
=n÷2×2(8+n)
=n×(8+n)
=8n+n^2
Answer :- a=9 ;d=11-9=2 ;
Sn = n÷2{2a+(n-1)d}.
=n÷2{2(9)+(n-1)2}
=n÷2{18+2n-2}
=n÷2{16+2n}
=n÷2×2(8+n)
=n×(8+n)
=8n+n^2
sheoranprateek:
bhai ye galat h
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