अंकों (0,1,2,3,4,5,6,7) से (5) अंकों की कितनी सम संख्याएँ बनेंगी जिनमें कोई अंक दोहराया न जाए और अंक (3) अवश्य आए?
Using the digits (0,1,2,3,4,5,6,7), how many (5)-digit even numbers can be formed without repetition and with the digit (3) included?
Explanation opens after your attempt
Correct Answer
B. (1740)
Concept
First count all even numbers and subtract those without (3). The complement method is efficient for inclusion conditions.
Why this answer is correct
The correct answer is B. (1740). First count all even numbers and subtract those without (3). The complement method is efficient for inclusion conditions.
Exam Tip
पहले सभी सम संख्याएँ गिनें और फिर बिना (3) वाली संख्याएँ घटाएँ। ऐसी शर्तों में पूरक विधि तेज रहती है।
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