exam Maths Puzzle Numerical Ability

Multiply
(x/3+3/4)(3x/4-3/5)

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exam Other Question

6x^2 - 28x + 16 A computer locks up if more than 4 applications are running simultaneously. If the owner has 20 applications stored in his program file, how many different sets of 4 can he run, so that his cmpuer does not lock up?