A box contains 20 electric bulbs, out of which 4 are defective. Two bulbs are chosen at random form this box. The probability that at least one of these is defective is ___

There is rectangular parking lot with a length of 2x and a width of x . what is the ratio of the perimeter of...

The ratio of income of A to that of B is 7 : 5 and the expenditure of A to that of B is 3 : 2 . If, at the end...

An empty bucket being filled with paint at a constant rate takes 6 min to be filled to 7/10 of its capacity. H...

In distributing milk at a summer camp it is found that a quart of milk will fill either 3 large glass tumblers...

A bank offers 5% inerest compounded half yearly. A customer deposits Tk. 1600 each on 1 st January and 1st Jul...

A rectangular fish tank 25m by 9m has water in it to a level of 2m. This water is carefully poured into a cyli...