Data Analysis Practice Test 1

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Directions (43-45): Study the information and answer the questions.
Liza wants to throw a grand party this new year.
So she invited all the friends on her Facebook and friends of her friends. Totally 73 persons including Liza attended her new year party.
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Question : 45 of 65
 
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How many handshakes are possible if they shake hands in a linear pair (straight line)?
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