exam Maths Puzzle Numerical Ability

12/√6

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exam Other Question

Please help solve the equation and give the x-value solution

1/2x+3/5y=3/2

-1/4x-1/8y=1/8 if you randomly select 2 cards from a standard 52-card deck. find the probability that the first card and the second card is red if
a: you replace the first card before selecting the second
b: you do not replace the first card