Number System MCQs

If 13 + 23 + .....+ 103 = 3025, then the value of 23 + 43 +.....+ 203 is :

There are 50 boxes and 50 persons. Person 1 keeps 1 marble in every box, person 2 keeps 2 marbles in every 2nd box, person 3 keeps 3 marbles in every third box. The process goes on till person 50 keeps 50 marbles in the 50th box. Find the total number of marbles kept in the 50th box.

The difference between the greatest and the least four digit numbers that begins with 3 and ends with 5 is :

If in a three digits number the last two digits places are interchanged a new number is formed which is greater than the original number by 45. What is the difference between the last two digits of that number ?

Which of the following is a perfect square ?

While solving a problem, by mistake, Anita squared a number and then subtracted 25 from it rather than first subtracting 25 from the number and then squaring it. But she got the right answer. What was the given number ?

The decimal fraction $$2.3\overline {49} $$ is equal to :

A number x when divided by 289 leave 18 as the remainder. The same number when divided by 17 leaves y as a remainder. the value of y is :

The digit at Hundred's place value of 17! is :