The sum of the digits in the number 67 is 13 (as 6 + 7 = 13).

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a. Show that the sum of the digits of the integers from 19 to 21 is 15.

b. Find the sum of the digits of the integers from 1 to 99.

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Cambridge International AS And A Level Mathematics Pure Mathematics 1 Coursebook

ISBN: 9781108407144

1st Edition

Authors: Sue Pemberton, Julian Gilbey

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Question Posted: Mar 10, 2023 05:52 AM

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The sum of the digits in the number 67 is 13 (as 6 + 7 = 13).

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Cambridge International AS And A Level Mathematics Pure Mathematics 1 Coursebook

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