To be clear, you can. Being in their presence for half a day wouldn't cause you to fall over dead. You aren't incapable of doing it.
What you mean is that you won't. You are refusing to do it. You aren't incapable, you just really don't want to.
And look, I get it. It's easier to tell yourself that spending a few hours with someone you don't like is literally impossible. That way, you can't be faulted for not doing it. You wouldn't be responsible for your own faults or failures if the things that would fix it were literally impossible. It's a comforting lie.
But just because you want something to be true doesn't make it so. You are, in fact, capable of spending a small handful of hours with someone you don't like. Your world won't end, and afterwards you can go back to sitting on your bed, playing vidya and jerking off. But you'll go back to that one step closer to self improvement.
The question is, what choice are you going to make. And make no mistake, it is a choice. Your hand isn't forced. And whichever way you go, that was your decision. Not something the world forced on you.
Yep. If the sun of the numbers is divisible by 3, the number is divisible by three.
Works great for 6 too, as if it's divisible by 3 and even, the number is divisible by 6.
And 9 is the same thing, but the sum has to be divisible by 9 (e.g. 12384 is divisible by 9 because the sum of the digits is 18, which is divisible by 9)
There's also good rules for 4 and 8 as well. If the last 2 digits are divisible by 4, the whole number is (e.g. 127924 is divisible by 4 because 24 is) and if the last 3 numbers are divisible by 8, the whole number is (e.g. 12709832 is divisible by 8 because 832 is.)