The common difference of an A.P., the sum of whose n terms is S<sub>n</sub>, is

Sum of n terms of the series $$\sqrt 2 $$  $$ + $$  $$\sqrt 8 $$  $$ + $$  $$\sqrt {…

The first and last term of an A.P. are a and l respectively. If S is the sum of all the terms of the A.P. and the common…

If k, 2k – 1 and 2k + 1 are three consecutive terms of an AP, the value of k is

What is the sum of the following series? -64, -66, -68, ......, -100

If the Arithmetic mean of 7, 5, 13, x and 9 is 10, then the value of x is

If four numbers in A.P. are such that their sum is 50 and the greatest number is 4 times the least, then the numbers are

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 …