The number of distinct prime factors of the largest 4-digit number is
2
3
5
none of these
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The largest 4-digit number is 9999.
By prime factorisation:
9999 = 3 × 3 × 11 × 101.
The distinct prime factors are 3, 11 and 101 — that is 3 distinct prime factors.
Hence, option 2 is the correct option.
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