The number of substrings that can be formed from a character string of length n?

Out of all the two digit numbers between 1 and 100, a number has to be selected at random. What is the probability that the selected number is not divisible by 7?

There is 60% increase in an amount in 6 years at simple interest. What will be the compound interest of Rs. 12,000 after 3 years at the same rate?

A container originally contains 10 litres of pure spirit. From this container 1litre of spirit is replaced with 1litre of water. Subsequently, 1 litre of this mixture is again replaced with 1 litre of water and this process is repeated one more time. How much spirit is now left in the container ?

Find the missing element:

2, 5, 10, 17, 26, x , 50, 64.

In a party, 60% of the invited guests are male and rest are female. If 80% of the invited guests attended the party and if all the invited female guests attended, what would be the ratio of males to females among the attendees in the party?

A is two years older than B who is twice as old as C. If the total of the ages of A, B and C be 27, then how old is B?

Among 150 faculty members in an institute, 55 are connected with each other via Facebook and 85 are connected via Whatsapp. 30 faculty members have neither Whatsapp or Facebook. The number of faculty members connected only via Facebook accounts is?

What is the value of ‘x’ in the following series?

2, 12, 60,240, 720, 1440, x, 0

 Find the smallest number ‘p’ such that ‘p multiplied by 162’ is a perfect cube.

5 skilled workers can build a wall in 20 days; 8 semi-skilled workers can build a wall in 25 days; 10 unskilled can build a wall in 30 days. If a team has 2 skilled, 6 semi-skilled workers and 5 unskilled workers, how long will it take to build the wall?

If 137 + 276 = 435; then how much is 731 + 672 ?

If ROAD is written as URDG, the SWAN should be written as ?

The area of a square is ‘d’. What is the area of the circle which has the diagonal of the square as its diameter?