You can
put this solution on YOUR website!Since it is a combination (not a permutation, since order doesn't matter - person A can be paired with person B, and it is no different than person B being paired with person A) use the "combination" function on your graphing calculator.
8 Choose 42 (simplify using a graphing calc)
Or, you can visit this website for the formula http://www.mathsisfun.com/combinatorics/combinations-permutations.html