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there are 20 people in a room if they each shake eachothers hands once and only once. how many handshakes are there all together
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there are 20 people in a room if they each shake eachothers hands once and only once. how many handshakes are there all together

User Intsco
by
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2 Answers

3 votes
19 they don’t shake their own hand I think
User PsychoX
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6 votes

Answer:

40

Explanation:

User Alen
by
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