Arithmetic Prog...

A man saved Rs. $$320$$ during the first month Rs. $$360$$ in the second month Rs. $$400$$ in the third month, if he continues his saving in this sequence in how many months will be save Rs. $$20,000$$?

Find the number of terms in an arithmetic progression for which the first term is $$4$$, last term is $$22$$ and the common difference is $$\displaystyle\dfrac{1}{4}$$

If the seventh term of an AP is 25 and the common difference is 4, then find the 15th term of AP.

If $$8$$ times the $$8th$$ term of an arithmetic progression is equal to $$12$$ times the $$12th$$ term, then the $$20th$$ term is

What is the common difference of an AP whose n$$^{th}$$ term is $$xn+y$$?

Find the common difference of an AP

Find the sum of first  20 terms of the sequence whose nth term is $$2n+3n$$

The sum of the three numbers in A.P is $$21$$ and the product of the first and third number of the sequence is $$45$$. What are the three numbers?

Find the sum of the AP: $$2,5,8,11,\dots$$ to first $$11$$ terms.