Arithmetic Prog...

If the $${2}^{nd}$$ term of an AP is $$13$$ and the $${5}^{th}$$ term is $$25,$$ what is its $${7}^{th}$$ term?

The $$4^{th}$$ term from the end of the AP: $$11, 8, 5, ..., -49$$ is

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

The $$21^{st}$$ term of the AP whose first term is $$3$$ and second term is $$4$$, is

The sum of the first $$16$$ terms of the AP: $$10, 6, 2,...$$ is

The sum of first five multiples of $$3$$ is

The sum of $$n$$ terms of an A.P. is $$4n^2-n$$. The common difference $$=$$ ____

Given the AP $$10, 7, 4, ....., -62$$.  The $$11^{th}$$ term from end of the AP is

The interior angles of a convex polygon are in Arithmetic

Progression. The smallest angle is $$120^{o}$$ and the common

difference is
$$ 5^{o}$$. What is the number of sides of the polygon?

If the $$n^{th}$$ term of an A.P. is given by $$a_n=5n-3$$, then the sum of first $$10$$ terms is