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UPSC Prelims

Mathematics

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Elementary Algebra / प्रारंभिक बीजगणित

Q19 2021, Elementary Algebra

Integers are listed from 700 to 1000. In how many integers is the sum of the digits 10?

700 से 1000 तक के पूर्णांकों को सूचीबद्ध किया गया है। इनमें से कितने पूर्णांकों में, अंकों का योगफल 10 है?

Explanation

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Following are the integers from 700 to 1000.

Where sum of their digits is 10.

703, 712, 721, 730 = 4

802, 811, 820 = 3

901, 910 = 2

In total there are 9 such integers between 700 and 1000.

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Q 19. 2021, Elementary Algebra

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