1. 6 car racers join a competition. In how many possible ways can they be arranged as first, second, third and fourth placers?
TOPIC: Permutation / Combination. Show the solutions
1. 6 car racers join a competition. In how many possible ways can they be arranged
as first, second, third and fourth placers?
A.1x2x3x4 B. 6! C. 6x5x4x3 D. 4!
2. Suppose you used combination lock to secure your bike. Later, you realized that you forgot the 5-digit code. You only remembered that the code contains the digits 9, 4, 3,1 and 0. How many possible codes are there?
A. 120 B. 24 C. 48 D. 625
3. In problem #2, if the first digit is an odd number, how many possible codes are there?
A. 120 B. 24 C. 48 D. 625
4. There are 2 red Toyota, 3 black Honda and 4 white Mitsubishi cars in a parking area. In how many ways can they be arranged in a row?
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