Which of the following is an irrational number?
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Answer and explanation
Answer: C. √5
√5 cannot be written as p/q; √4 = 2, 0.25 = 1/4 and 22/7 are all rational.
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Class 10 · Mathematics · Mathematics
1. Real Numbers
The prime factorisation of 140 is
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Answer and explanation
The Fundamental Theorem of Arithmetic says every composite number can be written as a product of primes in
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Answer and explanation
Answer: D. one way only, apart from the order of factors
The factorisation is unique; only the order of the prime factors can change.
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