Question 1202367
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The probability is

    P = {{{(4/7)*(3/6)}}} = reduce fractions = {{{(4/7)*(1/2)}}} = reduce fractions again = {{{2/7}}}.    <U>ANSWER</U>


First factor  {{{4/7}}}  is the probability to pick randomly one of 4 white shirts from the original total  4+3 = 7  shirts.


Second factor  {{{3/6)}}}  is the probability to pick randomly one of 3 blue shirts from the remaining  7-1 = 6  shirts.
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Solved, with explanations.