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An exam has 10 questions and Kunal must answer 7, including at least 3 of the first 5. How many choices does he have?

Competition practicePermutations & Combinations
  • A120
  • B50
  • C110
  • D100

Step-by-Step Solution

From the first 5 take 3, 4 or 5; the rest from the last 5. ignores the condition; note 7 answers already force at least 2 from the first 5.)
Answer: C) 110

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