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121 : 11 :: 169 : ?
12
13
14
15
13
Recognize standard square and square root relationships; the first number is the square of the second number.
Recognize standard square and square root relationships; the first number is the square of the second number.
Analyze the First Pair
Examine the relationship between 121 and 11. We know that 11 squared is 121 (or the square root of 121 is 11).
Apply the Pattern to the Second Pair
Apply the same square root operation to 169. The square root of 169 is 13, since 13 multiplied by 13 equals 169.
A: 12 squared is 144, not 169. C: 14 squared is 196, not 169. D: 15 squared is 225, not 169.
B is correct because 169 is the square of 13, matching the established pattern where 121 is the square of 11.
Always check for squares, cubes, and prime number relationships first when encountering number analogy or series questions.
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