Find the least value of ‘@’ to make the number 7@5471 perfectly divisible by 9.
3
The correct answer is 3.
+ d_1(1) + d_0(1) \pmod{9}$, which is simply the sum of its digits. A number is divisible by 9 if and only if it is congruent to 0 modulo 9, which means the sum of its digits must be congruent to 0 modulo 9, i.e., the sum of its digits is divisible by 9. This rule is very useful for quickly checking if large numbers are divisible by 9 without performing long division.
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