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twesh bappan lyallpuri Grade: 12
        

how am i supposed to sum the series 1.3.5+3.5.7+5.7.9 ......n terms without usin Sn -Sn=0 as a method. Like another method is given in hall n knight chp. i need an explaination for that method. Please help me with that method if possible or else ne other method will do!

6 years ago

Answers : (1)

Rahul askIITiansExpert.IITR
110 Points
										take the second number of the first term.

now we can say that for n=1, it is 2n+1

the whole expression becomes (2n-1)(2n+1)(2n+3)

use sumation and the formulas u already mus be knowing.

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Rahul- IIT Roorkee
6 years ago
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