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1 solution
S = 1 / 2 + 2 / 4 + 3 / 8 + 4 / 1 6 + . . . . . . . . ----(1)
1 / 2 S = 1 / 4 + 2 / 8 + 3 / 1 6 + . . . . . ----(2)
(1)-(2)
1 / 2 S = 1 / 2 + 1 / 4 + 1 / 8 + 1 / 1 6 + . . . . . . . . .
1 / 2 S = ( 1 − 1 / 2 ) 1 / 2 = 1
S = 2