How is it done ?
Explain me please
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1) 78*964
7+8+2+9+6+4 = 36 which is a multiple of 9 .
so it is divisible by 9
2) 75*
752 . since the last two digits that is 52 is a multiple of 4 .so it is divisible by 4
3) 2*345
2+1+3+4+5 = 15 which is a multiple of 3 . so it is divisible by 3