Question

find the sum of infinite sequence 2.5,-1,1/2.5,-1/6.25​

Answer 1

2.5-1+(1/2.5) -(1/6.25) =1.74

Answer 2

Sum = a1/1-r

where, a1 = first term of the sequence

            r = common ratio = a2/a1

            a2 = second term of the sequence

r = -1/2.5 = -0.4

Sum = 2.5/1-(-0.4)

        = 2.5/1.4

Sum = 3.9

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