Find the sum of all the odd integers from 7 to 7291 inclusive
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Answer:
A.P=7,9,11 ......................................7289,7291.
an=a+(n-1)d
7291=7+(n-1)2
7291-7=2(n-1)
(n-1)=7284/2
(n-1)=3642
n=3643
Sn=n/2{a+an}
Sn=3643/2[7+7291]
Sn=3643/2[7298]
Sn=3642[3649]
Sn=13289658
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