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From BITSAT question paper..It has both AP and GP..How to solve it?

From BITSAT question paper..It has both AP and GP..How to solve it?

Question Image
Grade:11

1 Answers

Harsh Patodia IIT Roorkee
askIITians Faculty 907 Points
5 years ago
For solving AGP just mulitpy by r and after shifting one place subtract as follows

​Sn = a + (a+d)r + (a+2d)r​2 + . . . .. + a​n
rSn= ar+(a +d)r​2 ​+ . . . . . + a​n-1 ​+ an
On subtracting you will observe that it will get simplified and this is general method to solve any AGP.

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