self Maths Puzzle

Find the number of divisors of 20!

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self Other Question

there are number marked on pages of a book by mistake a same number is marked on pages twice and the sum of all page numbers is found to be 1000 now, find the number that may be marked twice

option
a) 40
b) 15
c) 25
d) None of these find the sum of all factors of 720