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What is the sum of the numbers in the grid below?
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27 May 2020, 18:07
27 May 2020, 18:07
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Question Stats:
83% (01:11) correct
16% (01:24) wrong based on 6 sessions
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Understood that the first four columns get canceled out. Why do we sum horizontally as opposed to vertically?
Screenshot 2020-05-27 19.04.18.png [ 96.91 KiB | Viewed 2058 times ]
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Screenshot 2020-05-27 19.04.18.png [ 96.91 KiB | Viewed 2058 times ]
Show: :: OA
147
Re: What is the sum of the numbers in the grid below?
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27 May 2020, 21:09
27 May 2020, 21:09
1
closetheloopkid wrote:
Understood that the first four columns get canceled out. Why do we sum horizontally as opposed to vertically?
You can also sum it vertically as the second last column = \(3(1+2+3+4+5+6)\)
Similarly the last column = \(4(1+2+3+4+5+6)\)
Combining those two, we get \(3(1+2+3+4+5+6) + 4(1+2+3+4+5+6) = (3+4)(1+2+3+4+5+6) = 7(1+2+3+4+5+6)\)
Now it becomes easy, you just need to calculate the sum of first 6 integers.
the answer becomes \(7 \times 21 = 147\)
gmatclubot
Re: What is the sum of the numbers in the grid below? [#permalink]
27 May 2020, 21:09
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