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Question

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1+12+13++1n+1=11134597n22n+1.

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Solution

We know that;-
1u1+1u2+1u3+....+1un+1=1u1+u21u1+u2u22u2+u3......u2nun+un+1
u1=1,u2=2,u3=3,....
Above result can be proved by ;-
1ur+1ur+1=1ur+xr
xr=u2rur+ur+1
So by putting, u1,u2, etc we get
1+12+13+....+1n+1=11134597....n2n+1

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