# Q.10. If ${\mathrm{log}}_{2}\left({\mathrm{log}}_{2}\left({\mathrm{log}}_{3}x\right)\right)={\mathrm{log}}_{2}\left({\mathrm{log}}_{3}\left({\mathrm{log}}_{2}y\right)\right)=0$ then the value of (x + y) is: (a) 17 (b) 9 (c) 21 (d) 19

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