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1. I am unsure if my method is a efficient one. I put some numbers for n and x with n>x. ex. 3! +2 is divisble by 2. 5! +3 is divisible by 3. However 5!+7 is not divisible by 7 (when n<x). So concluded A.
2. As illustrated above if n<x and even if n! is not a prime number - it is not divisible by x. However if n>x, it is divisible by x. Since there are two possibilities, it is Insuff.
also got A here
As long as we know x is part of n!, then it is divisible by x because you can factor out x. Hence, by knowing that n is larger than x, x can be factored out and the expression is divisible by x _________________