Q. 4 A4.8( 5 Votes )

# Find the sum of t

Taking 5 in common we get

5(1 + 11 + 111 + ....n)

Now Multiply and Divide by 9 we get

)

)

Now First term is in GP.

10, 100, 1000…to n terms

Common Ratio = r =

Sum of GP for n terms = …(1)

a = 10, r = 10, n = n

Substituting the above values in (1) we get

For the second term the summation is n.

.

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