Question
Total of Series of n terms 1 + 1 + 3 + 1 + 3 + 5 + 1 + 3
+ 5 + 7 ……………………Solution
Series of n terms is = 1+4+9+16+…………………..+ n² 12+22+32+42+…………………….+ n² = (n(n+1)(2n+1))/6
Lens is made up of –
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