Total balls = 6 + 4 + 5 = 15 Total ways to choose 2 balls = 15C2 = 105 Ways to choose 1 red and 1 blue = 6C1 × 4C1 = 6 × 4 = 24 Probability = 24/105 = 8/35 Correct answer: b)
The average age of 10 men is increased by 2 years when two of them whose age are 24 and 26 years replaced by two new men. The average age of the two new...
Four numbers are arranged in ascending order. When the 1st two numbers are increased by the number equal to their position, and the last two numbers (i....
The average weight of 4 persons is 33 kg. The heaviest person’s weight is 30 kg more than the lightest person’s weight. If the average weight of the...
The combined average weight of 8 apples and 5 oranges is 150 grams. If the average weight of the apples is 180 grams, what is the average weight of the ...
The meaning of 12 observations is 15. One more observation is included, and the new mean becomes 17. The 13th observation is.
In an election between two candidates, the winner secured a victory margin of 720 votes. If 20% of the total votes polled were de...
In a group of 3 numbers, the 1st is double of 2nd and half of third. If the average of the three numbers is 56 then find the difference between t...
In an examination the average marks of Rohit is 55. If he got 15 more marks in science and 27 more marks in maths then his average would have been 61. F...
The average number of sweets distributed in a class of 25 students is 6. If ‘x’ number of students newly joined the class and the average becomes 5,...
The average of twelve numbers is 45.5. The average of the first four numbers is 41.5 and that of the next five numbers is 48. The 10th number...
