Concept-wise Practice

cube divisibility MCQ Questions for Class 10

cube divisibility se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

Practice Questions

1 questions tagged with cube divisibility.

यदि \(N=2^5\times3^4\times5^3\), तो (N) के ऐसे गुणनखंडों की संख्या कितनी है जिनका घन (N) को विभाजित करता है?

If \(N=2^5\times3^4\times5^3\), how many factors (d) are there such that \(d^3\) divides (N)?

Explanation opens after your attempt
Correct Answer

A. (8)

Step 1

Concept

Let \(d=2^a\times3^b\times5^c\), so \(d^3=2^{3a}\times3^{3b}\times5^{3c}\).

Step 2

Why this answer is correct

\(3a\le5\), \(3b\le4\), and \(3c\le3\), giving (2) choices each. Total (=8).

Step 3

Exam Tip

For cube divisibility, triple the exponents and compare. चरण 1: मान लें \(d=2^a\times3^b\times5^c\), तो \(d^3=2^{3a}\times3^{3b}\times5^{3c}\)। चरण 2: \(3a\le5\) से (a=0,1), \(3b\le4\) से (b=0,1), \(3c\le3\) से (c=0,1)। कुल \(2\times2\times2=8\)। चरण 3: घन वाले प्रश्न में घातों को (3) गुना करके सीमा जांचें।

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