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Monday 10 June 2019

Puzzle #3


Question:

12, X, 144, 441…….
 Find X?

Answer: 45.

Solution:
  • 12   => 3*1+9.
  • 144 => 3*X+9.
  • 441 => 3*144+9.

So, X=(144-9)/3.
X = 135/3.
X = 45.

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