The LCM of 30 and 45 is
15
30
45
90
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Prime factorisation of the given numbers are:
30 = 2 × 3 × 5
45 = 3 × 3 × 5
LCM = 2 × 3 × 3 × 5 = 90.
Hence, option 4 is the correct option.
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The number of common prime factors of 60, 75 and 105 is
2
3
4
5
The HCF of 144 and 198 is
6
9
12
18
If HCF of two numbers is 15 and their product is 1575, then their LCM is
105
525
1575
If the LCM of two natural numbers is 180, then which of the following is not the HCF of the numbers?
60
75