(c) Let $P(n) \equiv n(n + 1)(n + 2)$ $P(1) \equiv 1 \bullet 2 \bullet 3 = 6$ $P(2) \equiv 2 \bullet 3 \bullet 4 = 24$ Hence, it is divisible by 6.
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Ph.D. in Physics with 19+ years of teaching experience.