there are 10 persons who attended a birthday party,and each person said hello to each of the other person at once.How many hello's were said at the party? show your solution.
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there are 10 persons who attended a birthday party,and each person said hello to each of the other person at once.How many hello's were said at the party? show your solution.
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20
Step-by-step explanation:
because there are 10 persons
and each person say hello to other person at once
so there are 20
Answer:
Radio Waves. Radio waves are EM (Electromagnetic)waves that have wavelengths between 1 millimeter and 100 kilometers (or 300 GHz and 3 kHz in frequency).