SAT Math Question of the Day

Math Category: Prime Numbers:

Q: What's the sum of the first 3 prime numbers?

  1. 5
  2. 6
  3. 9
  4. 10
  5. 15

UNANSWERED.

The correct answer is D.

A: 10. The first 3 prime numbers are 2, 3, and 5. A prime number is a positive integer with exactly two factors: 1 and itself. This means that 1 is not a prime because it has only one factor.