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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