Three numbers which are co-prime to each other are such that the product of the first two is 119 and that of the last tw…

Given that, three numbers are such that the second number is twice the first and thrice the third. Also the average of t…

A virus known to cause a deadly disease, is also a rapid multiplier. It is known that it can double itself every 30 minu…

To write all the page numbers of a book, exactly 136 times digit 1 has been used. Find the number of pages in the book.

x is five digit number. The digit in ten thousands place is 1. the number formed by its digits in units and ten places i…

P is a prime number and (P<sup>2</sup> + 3) is also a prime number . The no. of numbers that P can assume …

Find the least number of five digits which is divisible by 333 ?

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