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Posted inUPSC CSAT

What is the sum of all digits which appear in all the integers from 10 to 100 ? 

Posted by By admin February 7, 2025
(UPSC CSAT - 2023) 855 856 910 911 Solution: Ans.(2.) Every non-zero digit (1, 2,…
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Posted inUPSC CSAT

A number N is formed by writing 9 for 99 times. What is the remainder if N is divided by 13?

Posted by By admin February 7, 2025
(UPSC CSAT - 2023) 11 9 7 1 Solution: Ans.(1.) As we know 1001 =…
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