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TIMO 2018 - Senior Secondary (Grades 10-12) - Preliminary Round - Paper 4 Question 13

TIMO · TIMO 2018 - Senior Secondary (Grades 10-12) - Preliminary Round - Paper 4

Question 13

How many positive integers $x$ make $\sqrt{x^2-22x+221}$ an integer?
  1. 1
  2. 2
  3. 3
  4. 4