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GATE 2026 Chemical Engineering, Q4 · General Aptitude

The correct answer is B, 24.

Question

How many 3-digit numbers can be formed using three distinct single digit prime numbers?

  • A. 64
  • B. 24
  • C. 12
  • D. 4

Official answer: 24

Why

GATE 2026 official key: (B). The single-digit primes are 2, 3, 5, 7 (4 digits); arranging 3 distinct digits from these 4 gives ⁴P3=4×3×2=24⁴P₃ = 4 \times 3 \times 2 = 24 numbers.

Explanation cross-checked for consistency. Final answer matches the official IIT answer key.

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