Given 4 red, 5 blue,3 green balls Total possible outcomes (selecting 2 out of 12 balls) =12C2= (12 × 11)/(2 × 1) = 66 Favorable outcomes (selecting 2 out of 4 red balls) =4C2= (4 × 3 × 2)/ (2 × 2 × 1) = 6 Favorable outcomes (selecting 2 out of 3 red balls) =3C2= (3 × 2)/ (2 × 1) = 3 => P(E) = (6 + 3)/66 = 9/66 = 3/22
The respective ages of a mother and her daughter are 30 and 8 years. In how many years will the mother be thrice as old as her daughter?
The ratio of age of ‘B’ after 6 years from now and age of ‘C’ 4 years ago from now is 7:4, respectively. The present age of ‘C’ is 40% of th...
There are 3 children in a family. The average age of the children is 16 years. If the present age of their mother and father is added, the average age o...
Nine years ago, the ratio of ages of Asha and Usha was 2:3, respectively. Seven years hence, the ratio of ages of Vimal and Usha will be 5:6, respective...
The ratio of the present ages of Naresh and Supara is 7: 3. Three years from now, the ratio of their ages will be 2 : 1. The current age of Naresh is___...
The present age of A is 9/4 times to that of his marriage age. Present age of his brother is 1/3rd of his present age. If A was married 35 years ago the...
What is A's present age, if after 15 years his age will be 5 times his age 7 years back?
If 7 years is subtracted from the present age of Rohit and the remainder is divided by 13, then the present age of his grandson Amit is obtained. If Ami...
Present average age of 4 friends: ‘A’, ‘B’, ‘C’ and ‘D’ is 33 years. If their ages are in the arithmetic progression in the same order a...
6 years ago, the ratio of the ages of Tara and Uma was 5:3. The present age of Sid is 14 years more than half of Uma’s present age. Find the present a...
