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  • Complete the given series. 21,20,38,54
Multiple choice

Complete the given series. 21,20,38,54

  1. 68

  2. 64

  3. 78

  4. 82

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

21,21-1*1,21-2*2,21-3*3,21-4*4

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