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What is the value of 16!/(14!·2!) + 15!/(13!·2!)?

Answer and explanation

Correct answer: 225

Simplify each factorial quotient separately by cancelling the common factorial in its denominator. For the first term, 16!/(14!·2!) = (16·15·14!)/(14!·2) = (16·15)/2 = 120. For the second term, 15!/(13!·2!) = (15·14·13!)/(13!·2) = (15·14)/2 = 105. Adding the two values gives 120+105 = 225. Therefore option C is correct. The factor 2! equals 2 and must be retained in both denominators; omitting it would double the terms. Option A is only the first term, option B is an incorrect near-total, and option D results from an arithmetic or cancellation mistake.

Related tags

Factorial NotationFactorial RatiosArithmetic SimplificationPermutations And CombinationsMathematicsClass 11 Mcq

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