Question 1138701
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Of the 15 cookies with pecans, 6 have chocolate chips also, so 9 cookies have only pecans.<br>
Of the ten cookies that have chocolate chips, 6 have pecans also, so 4 have chocolate chips only.<br>
So, of the 45 cookies, 9 have pecans only, 4 have chocolate chips only, and 6 have both.  So 19 of the 45 cookies have at least one of the two; that means the probability of picking a cookie with pecans or chocolate chips is 19/45.