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Difficulty: 2/102025 IOQM 2025 (Q16)

Find the number of positive divisors of the year .

Options:

  • 15

  • B.

    17

  • C.

    16

  • D.

    18

Guide / Hint

Hint 1: Find the prime factorization of 2025 first. It is divisible by 25 and 9.

Hint 2: The prime factorization is .

Hint 3: Apply the divisor formula: .

Solution

Step 1: Write the prime factorization of :

Step 2: The number of positive divisors is calculated by adding to each exponent and multiplying the results:

So has exactly positive divisors.

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    2025 IOQM 2025 Q16 - Olympiad Math Olympiad Question | Leminno