exam Maths Puzzle Numerical Ability

A bag contains 3 purple marble and 7 blue. Each marble selected is not put back into the bag before the next marble is selected. Find the probability of selecting a blue marble then a purple marble.

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exam Other Question
solve according to the given function equation: f(q)=q-(-1) : ((-1,0),(0,1),(1,_),(2,_),(3,_))

and f(t)=2+-6: ((-1,_),(0,_),(1,_),(2,_)


thank you!! What is -9 - the square root of 108 over 3 equal?