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Q.

The sum to infinity of the series S=1+23+632+1033+1434+…is

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a

4

b

6

c

2

d

3

answer is D.

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Detailed Solution

Let S=1+23+632+1033+1434+… 13S=13+232+633+1034+…Subtracting, we get     23S=1+13+432+433+434+…       =1+13+4/321−1/3=43+23=2⇒    S=3
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The sum to infinity of the series S=1+23+632+1033+1434+…is