UPSC CSE CSAT 2022 Toughest Question | Identity Card has the number ABCDEFG | Detailed Explanation

Detailed Explanation of one of the toughest question of CSAT 2022 paper 2 - By Amiya Sir
An Identity Card has the number ABCDEFG, not necessarily in that order, where each letter represents a distinct digit (1, 2, 4, 5, 7, 8, 9 only). The number is divisible by 9. After deleting the first digit from the right, the resulting number is divisible by 6. After deleting two digits from the right of original number, the resulting number is divisible by 5. After deleting three digits from the right of original number, the resulting number is divisible by 4. After deleting four digits from the right of original number, the resulting number is divisible by 3. After deleting five digits from the right of original number, the resulting number is divisible by 2. Which of the following is a possible value for the sum of the middle three digits of the number?
(a) 8 (b) 9 (c) 11 (d) 12


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[vikrant]

Never expected this much hard maths qstn in CSAT!

[AshishKumar-okuy]

Is this number system divisibility questions?

[wonwoo]

sir please can you refer any csat book for practice.

[archismandas]

Ques is good but it takes lots of time...