Answer with proof in attachment.
Answer:
<h2>12(x - 2) - 8x + 3 = 4x - 21</h2>
Step-by-step explanation:

1/2 of a chance he will often grab a yogurt (as there is a total of ten items (5/10). 2/10 (1/5) of a chance he will grab a green apple. and 3/10 of a chance he will grab a red apple. he will have around a 1/5 chance to not grab a yogurt on 3 consecutive days. (not sure about the not grabbing yogurt chances, but.......)<span />