exam Maths Puzzle Numerical Ability

Find the number of combinations

C
6 4

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exam Other Question

i totally dont understand this problem; (x-3/2)^2 * (1/x-3)^2
could someone may be explain how i should simplify it? Use properties of exponents to simplify. Write with positive exponents.

x^3/7 * x^1/5 / x^-1/3

I am thinking we multiply the num/ dem. But I am not sure where to start honestly. Thanks!