1.

If |a| lt 1, b = sum_(k=1)^(oo) (a^(k))/(k) rArr a=

Answer»

`sum_(K=1)^(OO)((-1)^(k)B^(k))/(k)`
`sum_(k=1)^(oo)((-1)^(k-1)b^(k))/(k!)`
`sum_(k=1)^(oo)((-1)^(k)b^(k))/((k-1)!)`
`sum_(k=1)^(oo)((-1)^(k-1)b^(k))/((k+1)!)`

Answer :B


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