Discussion
Find the one which does not belong to that group ?
Answer: B
All four are perfect squares, so look at what is being squared.
\[ 36 = 6^{2}, \quad 49 = 7^{2}, \quad 64 = 8^{2}, \quad 81 = 9^{2} \]
The roots 6, 8 and 9 are composite; 7 is prime.
So 49 does not belong - the square of the only prime root.
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