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Euclid's division lemma states that for positive integers $a$ and $b$, there exist unique integers $q$ and $r$ such that
A$a = bq + r,\ 0 < r \le b$
B$b = aq + r,\ 0 \le r < a$
C$a = bq + r,\ 0 \le r < b$
D$a = bq - r,\ r > b$
Answer & Solution
Correct answer: C. $a = bq + r,\ 0 \le r < b$
1. Dividing a by b gives a quotient q and a remainder r.
2. Euclid's lemma: $a = bq + r$ with $0 \le r < b$ (the remainder is always less than the divisor).
3. This is the basis of Euclid's algorithm for the HCF.
_Source: Karnataka SSLC (KSEEB) Class 10 Mathematics, Ch8 'Real Numbers', §8.2_
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