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1. If x4 = 81 and y2 = 49, then the maximum possible value of y - x?

  • A. 21
  • B. 21
  • C. 21
  • D. 21

Answer: Option B

Explanation:

x4 = 34

x = 3

এবং, , y2 = 72

y = 7

অতএব, x + y = 7 + 3 = 10

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