Multiple choice

Directions: In this question, a number series is given. Find out the missing number in the series. 399, 439, 481, ?, 571, 619

  1. 563

  2. 525

  3. 497

  4. 539

  5. 552
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B Correct answer
Explanation

The differences between consecutive terms are: 439-399=40, 481-439=42. If the pattern is +40, +42, +44, +46, +48, then 481+44 = 525, 525+46 = 571, 571+48 = 619. The pattern holds.

AI explanation

The differences between the consecutive terms form a sequence of prime numbers starting from 40. We calculate the differences as 439 - 399 = 40, 481 - 439 = 42, and 619 - 571 = 48. Following this pattern of even differences, the missing term is calculated by adding 44 to 481 to get 525. The missing number is 525.

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