The 24th term of an A.P. is twice its 10th term.

The 24th term of an A.P. is twice its 10th term. Show that its 72nd term is four times its 15th term.

Solution:

Which term of the list of numbers is the first negative term?

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.