Arithmetic Prog...

The sum of $$2, 7, 12, ..............$$ to $$10$$ terms is :

Which term in the $$\text{A.P.}~~ 5,13,21,...$$ is $$ 181 $$?

If the sum of $$n$$ terms of AP. is $$476, l = 20, a = 36$$, then $$n$$ is equal to : 

If $$\displaystyle a=3,n=20$$ and $$\displaystyle { S }_{ n }=300$$, then $$l$$ is :

The sum of $$n$$ natural number is : 

The $$3^{rd}$$ term of an A.P. is $$-40$$ and $$13^{th}$$ term is zero, then $$d$$ is equal to :

If numbers $$a, b$$ and $$c$$ are in AP, then 

The $$4^{th}$$ term of an AP is $$14$$ and its $$12^{th}$$ term is $$70$$. What is its first term? 

If $$p, (p - 2)$$ and $$3 p$$ are in AP, then the value of $$p$$ is 

The common difference of the $$A.P:\;\;5, 3, 1, -1,\dots$$ is