1.

If S_(1) = {2}, S_(2) = { (3)/(2) , (4)/(2) }, S_(3) = { (4)/( 4) , (5)/(4) , (6)/( 4) } , S_(4) = { (5)/( 8) , (6)/( 8) , (7)/(8) , (8)/( 8) } ,….. then the sum of numbers in S_(20) is

Answer»

`(1220)/( 2^(20))`
`(1563)/( 2^(19) -1)`
`(1445)/( 2^(18))`
`(1576)/( 2^(21))`

Answer :A


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