Using the concept of probability, the probability of not landing on yellow or red at all is 1/4.
Creating a square model of the two spins :
___ R ___ B ___ G ___ Y
R_ RR __ RB __ RG __ RY
B_ BR __ BB __ BG __ BY
G_ GR __GB __ GG __GY
Y_ YR __ YB __ YG __ YY
Combinations without red and yellow :
Recall :
P(without Red or Yellow) = 4/16 = 1/4
Hence, the probability of not landing on yellow or red at all is 1/4.
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