the number of distinct primes dividing `12!+13!+14!` is -

If A = {9, 10, 11, 12, 13} and let f : A rarr N is defined by f(x) = highest prime factor of x. then the number of distinct elements in the image of f is :

If A = {9, 10, 11, 12, 13} and let f : A rarr N is defined by f(x) = highest prime factor of x. then the number of distinct elements in the image of f is : "(a) 6 (b)7 (c) 8 (d) 4 "

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The number of distinct prime factors of the largest 4-digit number is

The number of distinct prime factors of the smallest 5-digit number is