Quantitative Aptitude - Arithmetic Ability Questions

Select the figure that does NOT belong in the following group.

Find the unit place digit in the expression given below:

1! + 2! + 3! + 4! + ..... + 20!

In the following question,select the missing number from the given alternatives.

7, 26, ?, 124, 215, 342

The perimeter of a square is 22 cm. Find its area (in cm2).

A man buys a watch for Rs. 1950 in cash and sells it for Rs. 2200 at a credit of 1 year. If the rate of interest is 10% per annum, the man:

In the following question, select the odd letter/letters from the given alternatives.

Select the letter which does NOT belong to the group.

A Contractor employed a certain number of workers  to finish constructing a road in a certain scheduled time. Sometime later, when a part of work had been completed, he realised that the work would get delayed by three-fourth of the  scheduled time, so he at once doubled the no of workers and thus he managed to finish the road on the scheduled time. How much work he had been completed, before increasing the number of workers?