To set a three-letter password for a website, a person selects two letters from the 33 alphabet and use one letter twice. How many different passwords are possible?
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In a survey, 130 people were asked how many movies they had seen in the preceding year. Their responses varied from 0 to 30 movies. The graphs above show two different summaries of the same survey results. How many people responded that they had seen 11 or 12 movies?
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