How many odd numbers from 1 makes the sum 961?

How many odd numbers are there below 25.

a) How many two digit numbers are there in all? b) If we choose one number from the two digit numbers, what is the probability that the sum of the digits of that number will be 10 ?

GAM of Hydrogen is 1g: How many number of atoms are there in 1 g of Hydrogen?

How many prime numbers are there below 30?

Calculate the arithmetic mean of even numbers' and odd numbers from 1 to 100 ?

How many number of moles are there in 1 g of Ca

How many consecutive natural numbers from 1 should be added to get 465?

How many numbers can be formed from the digits 1,2,3 and 9 if repetition of digits is not allowed?

Consider the arithmetic sequence -46,-42,-38,….., How many terms added from first to get the sum zero?