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Question

If \(4^{3} \times 5^6 = 10^m\), then find the value of \(m\).

This question was previously asked in
RRB NTPC 2015 CBT 1 Question Paper PDF (2-Apr-2016) (Shift 3)
The correct answer is

6

6 is correct.

Write 4 as a power of 2: \(4^3 = (2^2)^3 = 2^6\).

So the left side becomes \(2^6 \times 5^6 = (2 \times 5)^6 = 10^6\), using the rule \(a^n \times b^n = (ab)^n\).

Since the exponents are now equal, the two bases can be combined into one power of 10.

Comparing \(10^6 = 10^m\) gives \(m = 6\).

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