exam Maths Puzzle Numerical Ability

Solve using REF

x-y-2z=0
-2x+5y+10z=-3
3x+y=0

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exam Other Question

If 3 balls are drawn from a bag containing 3 red and 4 blue balls, what is the expected number of red balls in the sample? Factor my Integers:101,-52,-48,67,64,83