The number of two digit prime numbers which remain prime even inverting the position of its digits is:

The difference of the squares of two consecutive even integers is divisible by which of the following integers ?

Which of the following is the smallest fraction ? $$\frac{8}{{25}},$$ $$\frac{7}{{23}},$$ $$\frac{{11}}{{23}},$$ $$\frac…

Three-fifth of a number is equal to 70% of another number. What is the ratio between the first number and second number …

The sum of the digits of a two-digits numbers is 12 and when the digits of the to digit number are interchanged, the new…

If $$\frac{{51.84}}{{4.32}} = 12$$  , then the value of $$\frac{{0.005184}}{{0.432}}$$   is :

Find the HCF of (3<sup>125</sup>-1) and (3<sup>35</sup>-1).

The unit digit in the product 7<sup>71</sup> × 6<sup>63</sup> × 3<sup>65</s…