Mother of Pearl is

A bag contains 12 white pearls and 18 black pearls. Two pearls are drawn in succession without replacement. The probability that the first pearl is white and the second is black, is

Father of pearl industry is

Father of pearl industry is

The main component of pearl is

in Pearl Oyster, pearl is formed by secretion of

The price of a necklace varies directly as the no. of pearls in it. Also it varies directly as the square root of radius of a pearl. The price of a necklace was Rs. 150. When it had 75 pearls each of radius 1 cm. Find the radius of the pearl of a neclace having 100 pearls whose cost is Rs. 600.

Commercial pearl is formed by :

The generic name of pearl oyster is