चार चरणों वाली मशीन-श्रृंखला में क्रम से (3,4,5,6) विकल्प हैं। दूसरे चरण की एक मशीन के बाद तीसरे चरण की (2) मशीनें नहीं चुनी जा सकतीं। कुल वैध श्रृंखलाएँ कितनी हैं?
A four-stage machine sequence has (3,4,5,6) choices respectively. After one machine in the second stage, (2) machines in the third stage cannot be chosen. How many valid sequences are possible?
Explanation opens after your attempt
C. (324)
Concept
The second-third stages can be formed in \(1\times3+3\times5=18\) ways. Then multiply by \(3\times6\) choices for the first and fourth stages.
Why this answer is correct
The correct answer is C. (324). The second-third stages can be formed in \(1\times3+3\times5=18\) ways. Then multiply by \(3\times6\) choices for the first and fourth stages.
Exam Tip
दूसरा-तीसरा चरण \(1\times3+3\times5=18\) तरीकों से बनता है। फिर पहले और चौथे चरण के \(3\times6\) विकल्पों से गुणा करें।
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