SOLUTION: how many ways can you make it a sandwich by choosing 4 of 10 ingredients

Question 594458: how many ways can you make it a sandwich by choosing 4 of 10 ingredients
Found 2 solutions by richard1234, Alan3354:
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
Order doesn't matter, so use combination (instead of permutation)

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
how many ways can you make it a sandwich by choosing 4 of 10 ingredients
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If it's 4 different ingredients:
10*9*8*7 = 5040 ways
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But, ingred's ABCD is the same as ACDB, so divide by 4*3*2*1
--> 210 ways

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