Nine ex-schoolmates had a gathering. Each one of

Answered question

2022-04-07

Nine ex-schoolmates had a gathering. Each one of them shook hands
with all others once. How many handshakes were there?

Answer & Explanation

nick1337

nick1337

Expert2022-04-19Added 777 answers

Based on the given conditions, formulate: 9×(9-1)÷2

Calculate the sum or difference: 9×82
Cross out the common factor: 9×4
Calculate the product or quotient: 36
get the result: 36
Answer: 36
 

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