Arithmetic Prog...

The mean of five numbers in AP is $$89$$. The product of first and last terms is $$7885$$. The AM of first, third and fifth term is

The common difference of an Arithmatic Progression, whose $$3^{rd}$$ term is $$5$$ and $$7^{th}$$ term is $$9$$, is ...............

The  Sum of three numbers in AP is $$75$$, and product of extremities is $$609$$. The AM of first and second number is 

The sum of first $$10$$ terms and $$20$$ terms of an AP are $$120$$ and $$440$$ respectively. What is the common difference?

In a given A.P.,  $${ T }_{ 25 }-{ T }_{ 20 }=15$$. $$\therefore$$ $$d=$$............. for the A.P.

................ can be one of the term in Arithmetic progression 4, 7, 10, ...............

If $$1 + 6 + 11 + 16 + ... + x = 148$$, then the value of $$x$$ is

Find the sum of first 25 terms of an A.P. whose $$n^{th}$$ term is given by $$T_n = (7 - 3n)$$

The $$54^{th}$$ and $$4^{th}$$ terms of an A.P. are $$-61$$ and $$64$$ respectively. Find the $$23^{rd}$$ term.

The sum of all numbers of the form $$2k + 1$$, where $$k$$ takes on integral values from $$1$$ to $$n$$ is: