If $\frac{2+4+6+8-------\text { upto } n \text { terms }}{1+3+5+7-------\text { upto } n \text { terms…
If $\frac{2+4+6+8-------\text { upto } n \text { terms }}{1+3+5+7-------\text { upto } n \text { terms }}=\frac{37}{36}$, then $n=$
- 36
- 29
- 23
- 37
Solution
sum of $n$ even natural numbers $=n(n+1)$
sum of $n$ odd natural numbers $=n^{\wedge} 2$
$n(n+1) / n^{\wedge} 2=37 / 36$
$n+1 / n=37 / 36$
cross multiplication
$36(n+1)=37 n$
$36 n+36=37 n$
$37 n-36 n=36$
$n=36$
Asked in: MHT CET 2020 (12 Oct Shift 1)
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