Ask iit jee aieee pet cbse icse state board community Discussion Response Post to: solve these please!
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HIMANSHU JAIN (376)

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1) put f(x) = tx
f(1) = 5
=> t = 5
:. ans is 5m(m+1)/2

Himanshu Jain P.E.C. http://jainhim.blogspot.com/
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