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1. Which one of the following is the next number in the series : 7, 7, 14, 42, 168-----?

  • A. 336
  • B. 336
  • C. 336
  • D. 336

Answer: Option D

Explanation:

7  ×  1  =  7;7  ×  2  =  14; 14  ×  3  =  42; 42  ×  4  =  168; 168  ×  5  =  840

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