(7) अलग-अलग अक्षरों से (4) अक्षरों के गुप्त-कोड कितने बनेंगे यदि पुनरावृत्ति नहीं है?

How many (4)-letter codes can be formed from (7) distinct letters if repetition is not allowed?

Explanation opens after your attempt
Correct Answer

A. (840)

Step 1

Concept

Order matters in a code, so \(^{7}P_4=840\). In exams, think of permutation when forming codes.

Step 2

Why this answer is correct

The correct answer is A. (840). Order matters in a code, so \(^{7}P_4=840\). In exams, think of permutation when forming codes.

Step 3

Exam Tip

गुप्त-कोड में क्रम महत्वपूर्ण है, इसलिए \(^{7}P_4=840\)। परीक्षा में code बनने पर permutation सोचें।

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Mathematics Answer, Explanation and Revision Hints

(7) अलग-अलग अक्षरों से (4) अक्षरों के गुप्त-कोड कितने बनेंगे यदि पुनरावृत्ति नहीं है? / How many (4)-letter codes can be formed from (7) distinct letters if repetition is not allowed?

Correct Answer: A. (840). Explanation: गुप्त-कोड में क्रम महत्वपूर्ण है, इसलिए \(^{7}P_4=840\)। परीक्षा में code बनने पर permutation सोचें। / Order matters in a code, so \(^{7}P_4=840\). In exams, think of permutation when forming codes.

Which concept should I revise for this Mathematics MCQ?

Order matters in a code, so \(^{7}P_4=840\). In exams, think of permutation when forming codes.

What exam hint can help solve this Mathematics question?

गुप्त-कोड में क्रम महत्वपूर्ण है, इसलिए \(^{7}P_4=840\)। परीक्षा में code बनने पर permutation सोचें।