Multiple choice general knowledge math & puzzles

Four prime numbers are arranged in ascending order. The product of first three is 385 and that of last three is 1001. The largest prime number is:

  1. 11

  2. 13

  3. 17

  4. 9
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let the four primes in ascending order be p, q, r, s. From the products: p × q × r = 385 = 5 × 7 × 11, so p=5, q=7, r=11. For the last three: q × r × s = 1001 = 7 × 11 × 13. This confirms the pattern and gives s = 13 as the largest prime.

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