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Data Sufficiency Butler: August 2024
August 5DS 1DS 2
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Can anyone help me out with this question? Answer is 45.. I am unable to do these minimum/atleast questions in P&C
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10C2

We need to find number of possible pairs of people.
That is 10C2
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Handshake question: (9*10)/2
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First will shake hands with 9 people, second with 8, third with 7 and so on
Total = 9+8+7+.....+ 1 = (9x10)/2
The sum of first 9 numbers

OR

10C2
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PriyankaGmatIMD
Can anyone help me out with this question? Answer is 45.. I am unable to do these minimum/atleast questions in P&C
You can do it the "combinations" way by selecting number of ways 2 directors from 10 directors can shake hands = 10C2

OR the logical way.
Let’s say 10 directors are standing in a line. The first director can shake hands with 9 others. The second one already shook hands with the first one, so he/she has 8 options. Similarly, the next has 7 options and so on until the second last director will have only 1 option (the last director!) to shake hands. So total handshakes = 9 + 8 + 7 + 6....+ 3 + 2 + 1 = 45
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Thank you soooo much
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Problem Solving Butler: August 2024
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August 6CR 1CR 2
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Critical Reasoning Butler: August 2024
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Join us on YouTube to get top tips to master GMAT Quant redirect.php?id=lwe85nfg04
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The GMAT Quant session by TTP was great today. People who had missed it must watch the recording on youtube.
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Hi, does anybody know if the quant series of gmatninja on YouTube is still relevant for the gmat focus edition? (as it was created 2 years ago)
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