The number of common prime factors of 60, 75 and 105 is
2
3
4
5
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Prime factorisation of the given numbers are:
60 = 2 × 2 × 3 × 5
75 = 3 × 5 × 5
105 = 3 × 5 × 7
The common prime factors of 60, 75 and 105 are 3 and 5 — that is 2 common prime factors.
Hence, option 1 is the correct option.
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The digit by which '*' should be replaced in 7254*98 so that the number formed is divisible by 22 is
0
1
6
If a number is divisible by 5 and 6 both, then it may not be divisible by
10
15
30
60
The HCF of 144 and 198 is
9
12
18
The LCM of 30 and 45 is
45
90