46. Exemplar exercise problem VI

1. Two APs have the same common difference. The first term of one of these is $–1$ and that of the other is $– 8$. Then the difference between their $4^{th}$ terms is

 

2. If $7$ times the $7^{th}$ term of an AP is equal to $11$ times its $11^{th}$ term, then its $18^{th}$ term will be