A box contains 20 red and 15 white balls. The probability of drawing two balls of the same colour is?
Let S be the sample space. Then, n(S) = number of ways of drawing 2 balls out of 35 = 35C2 = (35 x 34)/(2 x 1) = 595 Let E= event of drawing 2 balls of the same colour n(E) = 20C2 + 15C2 = (20 x 19)/(2 x 1) + (15 x 14)/(2 x 1) = 190 + 91 = 281 Therefore, P(E) = (n(E))/(n(S)) = 281/595 ` `
In each problem, out of the four figures marked (1) (2) (3) and (4), three are similar in a certain manner. However, one figure is not like the other t...
In each of the following questions select the one which is different from the other three responses.
(A) Soybeans (B) Flax Seeds (C) Jowar (D) Mustard
Number of letters skipped in between adjacent letters goes on increasing successively by three in the series. Identify the set following the above rule.
Select the one which is different from the other three responses.
Find the odd word/ letters/number pair/number from the given alternatives.
In a diagram below, it represents students, painters and singers. Study the diagram and identify the region which represents those students who are pain...
Statement: Although the tribal women are familiar with beekeeping, their conventional method does not guarantee adequate returns.
Courses of ac...
Select the one which is different from the other three responses.
Select the one which is different from the other three responses.
