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Jamia Millia Islamia Previous Year PYQ Jamia Millia Islamia JAMIA MILLIA ISLAMIA MCA 2021 PYQ
Three numbers are chosen from 1 to 20.
Find the probability that they are consecutive.
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Jamia Millia Islamia Previous Year PYQ Jamia Millia Islamia JAMIA MILLIA ISLAMIA MCA 2021 PYQ
Solution
Total ways = $\binom{20}{3} = 1140$ Consecutive triplets: (1,2,3), (2,3,4), …, (18,19,20) → 18 sets. Required probability $= \dfrac{18}{1140} = \dfrac{3}{190}$ $\boxed{\text{Answer: (D) }\dfrac{18}{\binom{20}{3}}}$Jamia Millia Islamia
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