The number of distinct prime factors of the smallest 5-digit number is
2
4
6
8
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The smallest 5-digit number is 10000.
Prime factorisation: 10000 = 2 × 2 × 2 × 2 × 5 × 5 × 5 × 5.
The distinct prime factors are 2 and 5 — that is 2 distinct prime factors.
Hence, option 1 is the correct option.
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Which of the following is a pair of twin-prime numbers?
19, 21
43, 47
59, 61
73, 79
The number of distinct prime factors of the largest 4-digit number is
3
5
none of these
The sum of the prime factors of 1729 is
13
19
32
39
Which of the following is a pair of co-prime numbers?
8, 45
3, 18
5, 35
6, 39