Expert Mathematics Chapter 1: Real Numbers Class 10 Level 7

यदि \(m=2^3\times3^2\times5^2\), तो (m) के ऐसे गुणनखंडों की संख्या कितनी है जो (10) से विभाज्य हैं?

If \(m=2^3\times3^2\times5^2\), how many factors of (m) are divisible by (10)?

Explanation opens after your attempt
Correct Answer

A. (18)

Step 1

Concept

Since \(10=2\times5\), the factor must contain at least one (2) and one (5).

Step 2

Why this answer is correct

Powers of (2): (1,2,3) give (3) choices; powers of (3): (0,1,2) give (3) choices; powers of (5): (1,2) give (2) choices. Total (=18).

Step 3

Exam Tip

For divisibility, check the required minimum prime powers. चरण 1: \(10=2\times5\), इसलिए गुणनखंड में (2) और (5) दोनों कम से कम एक बार होने चाहिए। चरण 2: (2) की घात (1,2,3) यानी (3) तरीके; (3) की घात (0,1,2) यानी (3) तरीके; (5) की घात (1,2) यानी (2) तरीके। कुल \(3\times3\times2=18\)। चरण 3: किसी संख्या से विभाज्यता में उसके अभाज्य गुणनखंडों की न्यूनतम घात देखें।

FAQs

Mathematics Question FAQs

What is the correct answer to this Mathematics MCQ?

The correct answer is A. (18).

Where can I practice more Mathematics questions?

Open the subject page or level quiz links on this page to practice more active Mathematics MCQs with answers and explanations.

Related Mathematics Questions

Student Class Required

Select your class first

Quiz questions, daily challenge and practice pages will open according to your selected class. Class 11/12 ke liye stream bhi select karein.