self Maths Puzzle

How many zeroes are there between the decimal point and the first significant digit in (1/9)^200 given log 3 (base 10) = 0.4771?

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self Other Question

What is the last digit of 1! - 2! + 3! - 4! + 5! - 6!+ .......+99!?

a) 9
b) 1
c) 0
d) None of these
Find the number of factors of 40^3 - 17^3 - 23^3 ?