If you have 20 people in a party and each shakes everyone else's hand only once, how many...
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If you have 20 people in a party and each shakes everyone else's hand only once, how many handshakes take place?
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Answer: A. A) 380
Accurate technical and quantitative evaluation based on foundational principles.
Step-by-step Derivation:
Step 1: Formulate problem conditions.
Step 2: Apply logical deduction.
Step 3: Conclude correct option.