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

I got one more that is giving me problems! HELP PLEASE!! THANK YOU!

(2x/2x)(3x/5x)
/=the radical sign

Thanks in advance!
ac Solve this inequality: x/4 < -5 Note there is a line under the greater than sign