A perfect square ending in 6 must have its tens digit as:

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A Even
B Odd
C 5
D 0 (Zero)

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Answer: B. Odd

Squares ending in 6 come from numbers ending in 4 or 6, e.g. 4² = 16, 6² = 36, 14² = 196, 16² = 256, 24² = 576. In every case the tens digit (1, 3, 9, 5, 7) is odd.

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A perfect square ending in 6 must have its tens digit as:

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