There are eleven balloons floating in a big box. If one balloon clashes with another only once, how many clashes have there been?
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Answered by
3
Answer:
55
Step-by-step explanation:
1st Balloon Clashes= 10
2nd Balloon Cashes= 9
Etc....
10+9+8+7+6+5+4+3+2+1
Answered by
0
Answer:
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