Grade 109 grade maths
1/(21/2+1)+1/(31/2+21/2)+1/(41/2+31/2).........1/(91/2+81/2)
1/(21/2+1)+1/(31/2+21/2)+1/(41/2+31/2).........1/(91/2+81/2)
1 Answer
Arun
Dear Kamal
On multiplying by conjugate in Nr in Dr in each term
Then
We get-
sqrt(2) - 1 + sqrt(3) - sqrt(2) + sqrt(4) - sqrt(3) +.......+ sqrt(9) - sqrt(8)
= sqrt(9) - 1
= 3 - 1
= 2
Regards
Arun (askIITians forum expert)
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