1.

C_1//1-C_2//2+C_3//3-C_4//4+…+(-1)^(n-1) C_n//n=

Answer»

`1+(1)/(2)+(1)/(3)+….(1)/(N)`
`1+(1)/(2)-(1)/(2)-(1)/(3)+…(1)/(n)`
`1+(2)/(3)+(3)/(4)+…..+(n)/(n+1)`
none

Answer :A


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