exam Maths Puzzle Numerical Ability

there are 12 trumpet players in the marching band, but there is only room for 3 of them in the jazz band. how many diffrent combinations of trumpet players could be selected for the jazz band out of the 12?
a. 1728
b. 36
c. 1320
d. 220

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exam Other Question

Please show me how to factorise the following cubic equation
-2x^3 + 3x^2 - 3
Perform operation and simplify. I need to know how to set this equation up and solve it.
x^2-6x+8/x^2-17x+70 . x^2-15x+56/x^2-15x+44