exam Maths Puzzle Numerical Ability

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?

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exam Other Question

Martha can rake the leaves in her yard in 8 hours. Her brother can do the job in 6 hours. How long will it take them to do the job working together?Mar Solve using REF

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