Question

The expression is defined as the product of the integers from 1 through . If is the product of the integers from 100 through 299 and is the product of the integers from 200 through 299, which of the following is equal to ?
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Answer Choices

  • A.
    99 !
  • B.
    199 !
  • C.
  • D.
  • E.

Steps

ExplanationCalculationsHelp
Express as a ratio of factorials by observing that multiplying the integers from 100 through 299 is equivalent to dividing by the product of integers from 1 through 99.
Express as a ratio of factorials by observing that multiplying the integers from 200 through 299 is equivalent to dividing by the product of integers from 1 through 199.
Form the quotient using the expressions for and obtained in the previous steps.
Convert the complex fraction into a product by multiplying by the reciprocal of .
Cancel the common factors to arrive at the simplified expression.
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Final Answer

The final answer is , which corresponds to choice C.