CAT 2025 Number System Question (Hard)

Question

The sum of all the digits of the number left 10 50 10 25 - 123 right , is

Accepted Answer

10 50 10 25 - 123 can be written as 10 50 10 25 -123 1000-123 gives 877. 10000-123 gives 9877. 100000-123 gives 99877. 1000000-123 gives 999877. And so on. Considering 10 n-123, which has a total of n digits in general, of the n total digits the digit 7 is repeating 2 times, digit 8 is repeating 1 t

CAT 2025

Quantitative

Number System

Hard

The sum of all the digits of the number ( \left( 10 ^ { 50 } + 10 ^ { 25 } - 123 \right) ), is

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