A box contains one red, three blue, and two green marbles. Two marbles are selected at random in succession and without replacement. Let A={Both marbles selected are the same color.} Find P(A).

Answer: the correct answer is 10step-by-step explanation: let the number be n, then the expression becomes,then“twelve more than the quotient of a number and two, decreased by four” iswhen n=4,we substitute 4 whetever we see n to get,we simplify to obtain,we further simplify to get,therefore the correct answer is c.