अंकों (1,2,3,4,5,6,7) से (6) अंकों की कितनी संख्याएँ बनेंगी जिनमें अंक दोहराए न जाएँ और (1) कभी भी (2) के ठीक पहले न आए?
Using digits (1,2,3,4,5,6,7), how many (6)-digit numbers can be formed without repetition such that (1) is never immediately before (2)?
Explanation opens after your attempt
C. (4440)
Concept
Subtract arrangements containing the block (12) from total \(^{7}P_6\). Only the fixed order (1) immediately before (2) is forbidden.
Why this answer is correct
The correct answer is C. (4440). Subtract arrangements containing the block (12) from total \(^{7}P_6\). Only the fixed order (1) immediately before (2) is forbidden.
Exam Tip
कुल \(^{7}P_6\) क्रमों से (12) को ब्लॉक मानकर बने क्रम घटाएँ। केवल निश्चित क्रम (1) के बाद (2) को ही घटाना है।
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