Question #4422

Two dice each have faces numbered 1 to 6. They are rolled together. Choose the option that gives the probability that the difference of the numbers obtained is 1.

Expert's answer

Omega={(x1,x2)|x1=1,..,6; i=1,2}

A={(x1,x2)|x1-x2=1}U{(x1,x2)|x2-x1=1}

P(A)=|A| / |Omega| = (5+5)/(6*6)=10/36

A={(x1,x2)|x1-x2=1}U{(x1,x2)|x2-x1=1}

P(A)=|A| / |Omega| = (5+5)/(6*6)=10/36

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