A book has N pages. A teacher asked her students to add all the page numbers starting from 1 to N and tell her the result. Which of the following answers given by her students can be right?

8674

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9389

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7875

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7997

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Solution

The correct option is C 7875
Option (C) is the correct answer. Check the video for the approach.

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A book has N pages. A teacher asked her students to add all the page numbers starting from 1 to N and tell her the result. Which of the following answers given by her students can be right?

The correct option is C 7875Option (C) is the correct answer. Check the video for the approach.

The correct option is C 7875
Option (C) is the correct answer. Check the video for the approach.