Multiple choice

Ramu wants to choose 4 books with him for a campaign trip. If he has 11 books to choose from, then how many different ways are possible?

  1. 120

  2. 360

  3. 220

  4. 330

  5. 205
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Number of ways to choose 4 books from 11 = C(11,4) = 11!/(4!7!) = (11×10×9×8)/(4×3×2×1) = 7920/24 = 330. Option D is correct. This is a standard combination problem - order doesn't matter.

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