Question

For what value of $n$, are the $n^{th}$ terms of two $A.P^{\prime }S63,65,67,....$ and $3,10,\mathrm{17....}$ are equal.

Answer 1

$63+(n-1)2=3+(n-1)7$

$60=(n-1)5$

$n=12+1$

$=13$