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How many factors of (2^4 \times 5^3) will be divisible by (10)?
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Answer and explanation
Correct answer: 12
Step 1: A factor divisible by (10) must contain both (2) and (5). Step 2: The exponent of (2) has (4) choices from (1) to (4), and the exponent of (5) has (3) choices from (1) to (3). Total (4 \times 3=12). Step 3: Divisibility by (10) needs both primes.
Frequently asked questions
What is the correct answer to this question?
12
Why is this the correct answer?
Step 1: A factor divisible by (10) must contain both (2) and (5). Step 2: The exponent of (2) has (4) choices from (1) to (4), and the exponent of (5) has (3) choices from (1) to (3). Total (4 \times 3=12). Step 3: Divisibility by (10) needs both primes.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Real Numbers. Topic: Prime Factorisation.
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