Answer:
Step-by-step explanation:
Given
Jar contains 4 white and 4 black marbles
We randomly select 4 marbles out of which 2 are white and 2 are black
Probability that 2 white and 2 black marbles are selected is


The process is continue for n trails until we choose the correct order
i.e. we have to fail in n-1 trails
For exact n selection Probability is given by


1×5 or 5×1 would be a factual of it
I think it would be 70 cm
Cubed root (x^2) I can’t add the radical here but it would be the 3radical(x^2)