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$ B $ is a multiple of 11 - AMAZONAWS
$ B $ is a multiple of 11 - AMAZONAWS
📅 March 11, 2026
👤 scraface
Mar 11, 2026
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📌 Solution:** To solve this problem, we use the concept of combinations, as the order in which the instruments are showcased does not matter. The number of ways to choose 4 instruments from 7 is given by the binomial coefficient \(\binom{7}{4}\). The formula for combinations is:
📌 \binom{7}{4} = \frac{7!}{4! \times (7-4)!} = \frac{7 \times 6 \times 5 \times 4!}{4! \times 3 \times 2 \times 1} = \frac{7 \times 6 \times 5}{3 \times 2 \times 1} = \frac{210}{6} = 35
