Element in set of values of r for which, ^ 18 C _ r -2 +2 . ^ 18 C _ r -1 + ^ 18 C _ r ^…
Mathematics · JEE Advanced · NTA Exams — Binomial Theorem And Its Simple Applications
Element in set of values of r for which,
\({ }^{18} \mathrm{C}_{\mathrm{r}-2}+2 .{ }^{18} \mathrm{C}_{\mathrm{r}-1}+{ }^{18} \mathrm{C}_{\mathrm{r}} \geq{ }^{20} \mathrm{C}_{13}\) is :
\({ }^{18} \mathrm{C}_{\mathrm{r}-2}+2 .{ }^{18} \mathrm{C}_{\mathrm{r}-1}+{ }^{18} \mathrm{C}_{\mathrm{r}} \geq{ }^{20} \mathrm{C}_{13}\) is :
- 9
- 5
- 7
- 10
Answer
(A) 9, (C) 7, (D) 10
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