exam Maths Puzzle Numerical Ability

Which of these is not an expression:
z^y-6
y(z+5)
z+y+1
y + divided by z

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exam Other Question

Factor completely: x^2+16y^2-a^2-9b^2-8xy+6ab The sample space of an experiment is:
{A, B, C, D} AND P(A) = 0.1, P(B) = 0.3, P(C) = 0.4, P({A,C})=