



 
Hi Jeannine, Mathematicians call these combinations, in your case the number of ways of choosing 4 things from 70 things. The expression for the number of ways of choosing k things from n things is
where n! = n × (n  1) × (n  2) ×···× 2 × 1, Hence
If the n and k are large the arithmetic can become onerous. In this case Google can help. Go to Google and type the phrase 70 choose 4 into the search window. Google will respond with 70 choose 4 = 916 895. Penny
 


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