3 balls are drawn randomly from a bag contains 3 black, 5 red and 4 blue balls. What is the probability that the balls drawn contain balls of different colors?
An agent gets a commission of 2.5% on the sales of cloth. If on a certain day, he gets Rs.12.50 as
commission, the cloth sold through him on that day is worth
a) Rs.250 b) Rs.500 c) Rs.750
d) Rs.1250 e) None of these
A Students was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17,
21, 14 and x. He found the mean to be 12. What should be the number in place of x?
a) 3 b) 7 c) 17
d) 31 e) None of these