iran-konkur 2021 Q131

iran-konkur · Other · konkur-riazi_1400_specialized Number Theory Quadratic Diophantine Equations and Perfect Squares
131- How many five-digit multiples of 18 are perfect squares? $(\sqrt{10} \cong 3.16)$
(1) $35$ (2) $36$ (3) $37$ (4) $38$
\textbf{131-} How many five-digit multiples of 18 are perfect squares? $(\sqrt{10} \cong 3.16)$

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(1) $35$ \hfill (2) $36$ \hfill (3) $37$ \hfill (4) $38$

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