exam Maths Puzzle Numerical Ability

suppose that a 5-digit number is randomly generated using digits from the sets {2,3,4,6,7}. find the probability that the number has no repeated digits.

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exam Other Question

Graph the following inequalities:


4x+y >or= 4

3x-4y <12

y> 3
what is the simplified answer to (a^n-1*b^-2n)/ (a^n+1*b^2n-2). The directions say "assume that no denominator equals 0 and that m and n are integers greater than 1."