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question about which is NOT a surd

Answer:
[tex] \sqrt{72} [/tex]
[tex] \sqrt{201} [/tex]
[tex] \sqrt{52} [/tex]
These are surd
so A and D are not surd
Step-by-step explanation:
A surd is an expression that includes a square root, cube root or other root symbol. Surds are used to write irrational numbers precisely – because the decimals of irrational numbers do not terminate or recur, they cannot be written exactly in decimal form.