Question
1. How many 6-letter words can be formed using A, B, C, D, E, F, G, H, I if the letters in each word must
1. How many 6-letter words can be formed using A, B, C, D, E, F, G, H, I if the letters in each word must be distinct?
2. Find the number of ordered pairs (a,b) where a and b are integers such that a2-b2=10.
3. Let A={3,9,2,4,5,6,8,10}. Find the number of different pairings of A.
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Challenging Math Problems
Authors: Terry Stickels
1st Edition
0486808572, 9780486808574
