TCS Company Numerical Ability Permutation and Combination

There are 4 boys and 5 girls in two separate queues. The two queues are merged so that the positions of the boys (in relation to each other) and those of the girls (in relation to each other) remain unchanged. In how many ways can this be done?
option
a) 5!4!
b) 9P5
c) 9C5
d) (9C5 )^2

Read Solution (Total 5)

TCS Other Question
If the equation (k^2 - 5k + 6)x^2 + (k^2 - 7k + 12)x + k^2 - 9 = 0 satisfy more than two values of x, then the value of k is
option
a) -3
b) 3
c) 2
d) 4 A bag contains 6 balls of one or more colours. A ball is picked and is found to be red. What is the probability that the bag initially had exactly 6 red balls?
option
a) 2/7
b) 1/5
c) 3/5
d) 4/5