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Three numbers are in arithmetic progression. Their sum is 21 and their product is 231. The numbers are:

Competition practiceAlgebra
  • A1, 7, 13
  • B3, 7, 11
  • C5, 7, 9
  • D2, 7, 12

Step-by-Step Solution

Take the numbers as , a, . Their sum gives . Then gives , so and . The numbers are 3, 7, 11 .
Answer: B) 3, 7, 11

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