independent and dependent events

If P (not A)  = 3/4....then P(A) = 1/4

If independent

P(A and B ) = P(A) * P(B)

3/40  =  1/4 * 3/10

3/40  = 3/40    Independent....good job !!!

Second one

P(A and B)  = P(A) * P(B)

9/100  =  1/ 5  *  9 /20

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