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Suppose that a “word” is any string of seven letters of the alphabet, with repeated letters allowed. How many words begin with A or B?

		52⁶
		2*(26⁶)
		2*(26⁵)
		52⁵

Which of the following is the number of words of seven letters of the alphabet, with repeated letters allowed, that have exactly one vowel?

		5*20⁶
		5720⁶
		5721⁶
		5*21⁶

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