If the pth term of an A.P. is q and the qth term is p.

If the pth term of an A.P. is q and the qth term is p, show that its nth term is (p + q – n)

Solution:

How many three-digit numbers are divisible by 9?

Solution:

More Solutions:

• The nth term of an A.P. cannot be n² + n + 1.
• Find the sum :
• How many terms of the A.P. -6, (-11/2), (-5), …..
• Find the sum of first 20 terms of this A.P.
• The sum of the first 14 terms of an A.P. is 1505 and its first term is 10.
• The sum of first n term of an A.P. is 3n² + 4n.