Formula Used:
When sum of digit of any number is multiple of 9, the number is divisible by 9.
Solution:
3789 = 3 + 7 + 8 + 9 = 27 divisible by 9
7857 = 7 + 8 = 5 + 7 = 27 divisible by 9
1845 = 1 + 8 + 4 + 5 = 18 divisible by 9
And
3658 = 3 + 6 + 5 + 8 = 22 not divisible by 9
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