NDA 2021 Mathematics question
3-digit numbers are formed using the digits 1, 3, 7 without repetition of digits. A number is randomly selected. What is the probability that the number is divisible by 3?
Answer: (A)
Solution
Every 3-digit number formed without repetition uses all the digits 1, 3 and 7, so its digit sum is . A number is divisible by 3 only
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