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Let x and y be defined as the sum of all integers between x and y.
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17 May 2021, 05:23
17 May 2021, 05:23
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78% (01:44) correct
21% (02:51) wrong based on 14 sessions
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Let \(x \divideontimes y\) be defined as the sum of all integers between 𝑥 and 𝑦. For example, \(1 \divideontimes 4=2+3=5\). What is the value of \((60 \divideontimes 900)-(63 \divideontimes 898)\)?
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
Show: :: OA
1983
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
Let x and y be defined as the sum of all integers between x and y.
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17 May 2021, 12:02
17 May 2021, 12:02
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The sign X(⋇)Y indicates the sum of all the integers between X and Y excluding.
So, (60⋇900) = 61+62+63+64+..........896+897+898+899
and (63⋇898) = 64+65+66+................895+896+897
-------------------------------------------------------
(-) = 61+62+63+898+899
= 1983
So, (60⋇900) = 61+62+63+64+..........896+897+898+899
and (63⋇898) = 64+65+66+................895+896+897
-------------------------------------------------------
(-) = 61+62+63+898+899
= 1983
Re: Let x and y be defined as the sum of all integers between x and y.
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19 Oct 2024, 12:17
19 Oct 2024, 12:17
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