Consider the following in respect of natural numbers a, b and c:
1. LCM(ab, ac) = a LCM(b, c)
2. HCF(ab, ac) = a HCF(b, c)
3. HCF(a, b) < LCM(a, b)
4. HCF(a, b) divides LCM(a, b).
Which of the above are correct?
1 and 2 only
3 and 4 only
1, 2 and 4 only
1, 2, 3 and 4
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