The probability of selecting a male or a female is same. If the probability that in an office of `n` person `(n-1)` males being selected is `3/(2^(10))`, the value of `n` is a. `5` b. `3` c. `10` d. `12`

Kamal and Monica appeared for n interview for two vacancies. The probability of Kamal’s selection is 1/3 and that of Monika’s selection is 1/5. Find the probability that Both of them will be selected None of them will be selected At least one of them will be selected Only one of them will be selected.

One mapping is selected at random from all mappings of the set S={1,2,3,.... n} into itself. If the probability that the mapping is one-one is 3/32, then the value of n is 2 b. 3 c. 4 d. none of these

(n>=5) persons are sitting in a row. Three of these are selected at random. The probability that no two of the selected persons sit together is

Out of 3n consecutive integers, there are selected at random. Find the probability that their sum is divisible by 3.

Out of 3n consecutive integers, three are selected at random. Find the probability that their sum is divisible by 3.

Column I, Column II If the probability of getting at least one head is at least 0.8 in n trials, then value of n can be, p. 2 One mapping is selected at random from all mappings of the set s={1,2,3, ... ,n} into itself. If the probability that the mapping being one-one is 3/32, then the value of n is, q. 3 If m is selected at random from set {1,2,..., 10} and the probability that the quadratic equation 2x^2+2m x+m+1=0 has real roots is k , then value of 5k is more than, r. 4 A man firing at a distant target as 20% chance of hitting the target in one shoot. If P be the probabililty of hitting the target in "n" attempts , where 20 P^2-13 P+2lt=0, then the ratio of maximum and minimum value of n is less than, s. 5

A month is selected at random in a year. The probability that it is March or October, is 1/(12) (b) 1/6 (c) 3/4 (d) None of these

The ploidy of the aleurone cell when a "4n" female plant is crossed with "2n" male plant

If .^(n)P_(3)+.^(n)C_(n-2)=14n , the value of n is (a) 5 (b) 6 (c) 8 (d) 10

Suppose A is a complex number and n in N , such that A^n=(A+1)^n=1, then the least value of n is 3 b. 6 c. 9 d. 12