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Sum of consecutive odd numbers gives cubes. The block for is 13 + 15 + 17 + 19.
What is the FIRST (smallest) odd number in the block that sums to ?

Class 8Patterns in CubesCubes and Roots
  • A21
  • B19
  • C23
  • D25

Step-by-Step Solution

Blocks use odd numbers in order: 1 | 3,5 | 7,9,11 | 13,15,17,19 | 21,23,25,27,29. The block starts at 21.
Answer: A) 21

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