1.

Consider an infinite geometric series with first term a and common ratio r. If its sum is 4 and the second term is ( 3)/( 4) , then :

Answer»

`a = 2, R = (3)/(8)`
`a = (4)/(7), r = (3)/(7)`
`a = (3)/(2), r = (1)/(2)`
`a = 3, r = (1)/(4)`

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