यदि \(^{15}C_{r}=^{15}C_{r+3}\) और indices अलग हैं, तो (r) का मान क्या होगा?
If \(^{15}C_{r}=^{15}C_{r+3}\) and the indices are different, what is the value of (r)?
Explanation opens after your attempt
Correct Answer
B. (6)
Concept
Unequal equal-combination indices are complementary, so (r+r+3=15). In exams set the sum of lower indices equal to the upper index.
Why this answer is correct
The correct answer is B. (6). Unequal equal-combination indices are complementary, so (r+r+3=15). In exams set the sum of lower indices equal to the upper index.
Exam Tip
Unequal equal-combination indices complementary होते हैं, इसलिए (r+r+3=15)। परीक्षा में lower indices का sum upper index के बराबर रखें।
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