Choose the number which is different from others in the group:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 15
Option (1) 11 — a prime number, divisible only by 1 and itself.
Option (2) 13 — a prime number.
Option (3) 15 — \(15=3\times5\), a composite number, so 15 is the odd one out among three primes.
Option (4) 17 — a prime number.