Permutation and CombinationHard
Question
The number of proper divisors of apbqcrds where a, b, c, d are primes & p, q, r, s ∈ N is -
Options
A.pqrs
B.(p + 1) (q + 1) (r + 1) (s + 1) - 4
C.pqrs - 2
D.(p + 1) (q + 1) (r + 1) (s + 1) - 2
More Permutation and Combination Questions
How many cricket eleven can be formed from 15 persons if captain is included in every team?...There are (p + q) different books on different topics in Mathematics. (p q) If L = the number of ways in which these boo...Which of the following statement(s) is/are true :-...A set contains (2n + 1) elements. The number of subset of the set which contain at most n elements is : -...The total number of ways to purchase one or more books from 4 books by a student are-...