QOD-25/05/13

Find
12.4+1.32.4.6+1.3.52.4.6.8+....till n terms

3 Answers

1357
Manish Shankar ·

take 1/2 common

and write 14=4-34
and write 1.34.6=1.3.(6-5)4.6

and so on

proceed to get the answers

1357
Manish Shankar ·

this one is good

1123
Sourish Ghosh ·

\sum \frac{\binom{2r}{r}}{2^{2r+1}(r+1)}

How to proceed after this?

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