There 5red,6white , and 7 blue disks. you pick out a disks , record its color , and it turn it to the box . if you repeat this process 250 times , how many times van you expect to pick either a red or white disk?

 However, I am told: “Box A contains 1 red ball and three white balls; Box B has ... I randomly pick a box and select a ball from the box without looking into the box. ... If box B had 2 redand 4 white the probability of a red ball would be 1214+1213=18+16=724 , but you would have 1+24+6=310 4185 times.

S= B - 72
B= B
180= B+B-72
180= 2B-72
252= 2B
126 = B
B =126
S= 126-72
S=54