How many digit required to write numbers from 1 to 50 ?

The sum of the squares of 3 consecutive positive numbers is 365. The sum of the numbers is -

The remainder , when (15<sup>23</sup> + 23<sup>23</sup>) is divided by 19, is

What decimal of a week is an hour ?

The remainder when 6<sup>6<sup>6<sup>6<sup>.<sup>.<sup>∞</sup></sup&g…

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

12345679 × 72 is equal to -

If 17<sup>200</sup> is divided by 18, the remainder is -