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Leetcode Problem 1175. Prime Arrangements

1175. Prime Arrangements

Leetcode Solutions

Counting Primes and Factorial Calculation

  1. Initialize a constant MOD with the value 10^9 + 7 for modulo operations.
  2. Create a function is_prime to check if a number is prime.
  3. Count the number of prime numbers up to n using the is_prime function.
  4. Calculate the factorial of the number of primes and the factorial of the number of non-primes separately, using modulo MOD.
  5. Return the product of the two factorials modulo MOD.
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