SIG Online Assessment

新人求米 🥲🥲 Frog needs to move from (0,0) to (7,4). Can only go up or right one step at a time and cannot move 3 directions in a row (UUU or RRR). Answer: 30.
Determine knights (who only tell the truth) and knaves (who o

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et? Answer: Use linearity of expectation with indicators equal to 1 if you have pair i and 0 otherwise. Then it is $4 \times 6Choose2 / 8Choose4 = 6/7$.