Sum of two numbers is thrice their difference. Their ratio is :

The greatest four digit number which is exactly divisible by each one of the numbers 12, 18, 21 and 28 :

If (-1)<sup>n</sup> + (-1)<sup>4n</sup> = 0, then n is

397 × 397 + 104 × 104 + 2 × 397 × 104 = ?

When we reverse the digits of the number 13, the increases by 18. How many other two digit numbers increases by 18 when …

$$\left( {{2^{71}} + {2^{72}} + {2^{73}} + {2^{74}}} \right)$$     is divided by :

Two positive whole numbers are such that the sum of the first and twice the second number is 8 and their difference is 2…

Half way through the journey from Delhi to Lahore Atalji began to look out of the window of the Samjhauta Express and co…