(Q). If N is a product of factorial of four consecutive positive integers then which of the following is/are correct about N.
(i) if N is a three digit number then there exists two such value of N. ➡ ✖
(ii) if N is a Five digit number then there exists only one such value of N. ➡ ✔
(iii) N may be a four digit number. ➡✖
Solution:-
if N = 1!.2!.3!.4! = 288
N = 2!.3!.4!.5! = 34560
N = 3!.4!.5!.6! = 12441600
N = 4!.5!.6!.7! = 10450944000