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

The sum of first n odd natural numbers in

The 4<sup>th</sup> and 7<sup>th</sup> term of an arithmetic progression are 11 and -4 respective…

The sum of the first 16 terms of an AP whose first term and third term are 5 and 15 respectively is

If 7<sup>th</sup> and 13<sup>th</sup> terms of an A.P. be 34 and 64 respectively, then its 18&lt…

Find the n<sup>th</sup> term of the following sequence :</br> 5 + 55 + 555 + . . . . T<sub>n<…

If the 3<sup>rd</sup> and the 5<sup>th</sup> term of an arithmetic progression are 13 and 21, wh…

The sum of first 20 odd natural numbers is