If $^{15}C_{r}:^{15}C_{r-1}=11:5$ then r=

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If $^{15}C_{r}:^{15}C_{r-1}=11:5$ then r=

E

Editor

Sep 18, 2022

If $^{15}C_{r}:^{15}C_{r-1}=11:5$ then r=

Difficulty: Easy

A:

15

B:

16

C:

11

D:

6

ID: 63273dbaca83163ac3a1247d