book Maths Puzzle Numerical Ability

I need help on finding the probability of drawing a spade and then a club from a standard 52 card deck (without replacement)

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book Other Question

Steven and Sarah can finish apiece of work in 18days. Steven can do the job himself in twenty-four days. If Sarah wanted to do the job alone, how long would it take her? the longest side of a right triangle is 15 cm. Another side measures 12 cm. What is the length of the third side?