If the fifth term of a GP is 81 and first term is 16, what will be the 4<sup>th</sup> term of the GP?

How many 2-digit positive integers are divisible by 4 or 9?

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

The next term of the A.P., $$\sqrt 7 ,$$ $$\sqrt {28} ,$$ $$\sqrt {63} ,$$ . . . . . .

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

The sum of first 20 odd natural numbers is

How many terms are there in 20, 25, 30 . . . . . . 140?

Given A = 2<sup>65</sup> and B = (2<sup>64</sup> + 2<sup>63</sup> + 2<sup>62&l…