एक फोटो एल्बम में (4) स्थान हैं। (7) अलग फोटो में से लगाए जाते हैं। एक विशेष फोटो लगे तो वह किनारे पर ही लगेगी। कुल व्यवस्थाएँ कितनी होंगी?
A photo album has (4) positions. Photos are placed from (7) distinct photos. If a special photo is used, it must be placed at an end position. How many arrangements are possible?
Explanation opens after your attempt
C. (840)
Concept
If the special photo is not used, arrangements are \(6 \times 5 \times 4 \times 3\). If used, it has (2) end choices and the rest have \(6 \times 5 \times 4\) choices.
Why this answer is correct
The correct answer is C. (840). If the special photo is not used, arrangements are \(6 \times 5 \times 4 \times 3\). If used, it has (2) end choices and the rest have \(6 \times 5 \times 4\) choices.
Exam Tip
विशेष फोटो न लगे तो \(6 \times 5 \times 4 \times 3\) व्यवस्थाएँ हैं। लगे तो उसके (2) किनारे और बाकी \(6 \times 5 \times 4\) विकल्प हैं।
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