1.

Let Let 1/x_1,1/x_2...1/x_n(x _i ne0" for "i=1,2,...n) in A.P. Such that x_1=3 and x_21=20.If n is the least positiveinteger for which x_n gt 50" then" sum_(i=1)^n(1/x_i) is equal to:

Answer»

`1//8`
3
`13//8`
`13//4`

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