exam Maths Puzzle Numerical Ability

how do you know exactly when the problem is a combination or a permutation?
how do you label the problem? ex. 4 super script c 3? how do you solve these?

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exam Other Question

The product of two consecutive even intergers is 360. Find the intergers. This is actually more trig. i think...

For a ball going around a unit circle with speed 1

(a) how long does it take for 5 revolutions
(b) at time t=3*pie*/2 where is the ball?
(c) at t=22 where is the ball (approximately)