1.

Sum of the first 20 terms of the series 1/((2)(4))+((1)(3))/((2)(4)(6))+((1)(3)(5))/((2)(4)(6)(8))+…. is

Answer»

`1/2-1/(2^(40))(""^(40)C_(20))`
`1/2-1/(2^(41))(""^(42)C_(21))`
`1/2-1/(2^(42))(""^(42)C_(21))`
`1/2-1/(2^(43))(""^(40)C_(20))`

ANSWER :C


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