यदि (7) लड़कों और (6) लड़कियों में से (3) लड़के तथा (2) लड़कियाँ चुननी हों, तो formula कौन-सा है?
If (3) boys and (2) girls are selected from (7) boys and (6) girls, which formula is correct?
Explanation opens after your attempt
D. \(^{7}C_3\times{}^{6}C_2\)
Concept
There is unordered selection in two categories, so combinations are multiplied. In exams count category-wise selections separately.
Why this answer is correct
The correct answer is D. \(^{7}C_3\times{}^{6}C_2\). There is unordered selection in two categories, so combinations are multiplied. In exams count category-wise selections separately.
Exam Tip
दो categories में बिना क्रम selection हो रहा है, इसलिए combinations multiply होंगे। परीक्षा में category-wise selection को अलग-अलग गिनें।
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