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The sum of first n terms of the seque...

The sum of first n terms of the sequence `1,1+2,(1+2+2^(2)),....,(1+2+2^(2)+.....+2^(k)-1)` , is of the form `2^ (n + R) + S n^ 2 + T n + U` , t h e n The value of ( R + S + T + U ) is-

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