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The sum of the first 9 integers is
1+2+3+4+5+6+7+8+9 = 45
We need 5 more to get 50.
If we add 10 and take out the 5 that would do the trick.
1+2+3+4+6+7+8+9+10 = 50. That's one answer.
Or we could add ll and take out the 6
1+2+3+4+5+7+8+9+11 = 50. That's another answer.
Or we could add l2 and take out the 7
1+2+3+4+5+6+8+9+12 = 50. That's another answer.
We can make another one out of that one, by replacing
the 9+12 by 10+11
1+2+3+4+5+6+8+10+11 = 50. That's another answer.
Or we could add l3 and take out the 8
1+2+3+4+5+6+7+9+13 = 50. That's another answer.
We can make another one out of that one, by replacing
the 9+13 by 10+12
1+2+3+4+5+6+7+10+12 = 50. That's another answer.
Or we could add l4 and take out the 9
1+2+3+4+5+6+7+8+14 = 50. That's another answer.
So that gives you 7 different answers to get 50.
Edwin