X+1=y+1
X-Y= 0
Hope this helped you
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I will give you a explanation about how I got the answer!
Plus, I'm am so sorry if I answer this so long...
Hope It Helped! :)
Answer:
...... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
There are
ways of picking 2 of the 10 available positions for a 0. 8 positions remain.
There are
ways of picking 3 of the 8 available positions for a 1. 5 positions remain, but we're filling all of them with 2s, and there's
way of doing that.
So we have

The last expression has a more compact form in terms of the so-called multinomial coefficient,
