Multiple choice

Find the missing terms in the given series: 1991 1964 1900 1775 ?

  1. 1569

  2. 1559

  3. 1625

  4. 1635

  5. 1669
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B Correct answer
Explanation

The pattern of differences is: 1991 - 1964 = 27 = 3³, 1964 - 1900 = 64 = 4³, 1900 - 1775 = 125 = 5³. The next difference should be 6³ = 216. Therefore, 1775 - 216 = 1559. This is a cube series where each term decreases by consecutive cubes starting from 3³.

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