The 7<sup>th</sup> and 21<sup>st</sup> terms of an AP are 6 and -22 respectively. Find the 26&lt…

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

What is the sum of all 3 digit numbers that leave a remainder of '2' when divided by 3?

The number of terms of the A.P. 3, 7, 11, 15, ....... to be taken so that the sum is 406 is

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

If the sum of n terms of an A.P. be 3n<sup>2</sup> + n and its common difference is 6, then its first term i…

If the first term of an A.P. is a and nth term is b, then its common difference is

If the sums of n terms of two arithmetic progressions are in the ration $$\frac{{3n + 5}}{{5n + 7}},$$   then t…