B.
Answer to the riddle: Seven
1. 10 × 9 × 8 × 7 = 5,040
2. 5 × 4 × 3 × 2 = 120
3. Formula for circular arrangement is n - 1. So, (7 - 1) = 720.
4.10 × 9 × 8 × 7 × 6 × 5 × 4 = 604,800
5. 3 × 2 × 1 × 5 × 4 × 3 × 2 × 1 × 2 × 1 = 1,440.
If you need help in understanding the combinations above, kindly tell me at the comments.
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Answers & Comments
B.
Answer to the riddle: Seven
1. 10 × 9 × 8 × 7 = 5,040
2. 5 × 4 × 3 × 2 = 120
3. Formula for circular arrangement is n - 1. So, (7 - 1) = 720.
4.10 × 9 × 8 × 7 × 6 × 5 × 4 = 604,800
5. 3 × 2 × 1 × 5 × 4 × 3 × 2 × 1 × 2 × 1 = 1,440.
If you need help in understanding the combinations above, kindly tell me at the comments.