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What is  equal to ?

This question was previously asked in
CDS 02/2022 Elementary Mathematics Official Paper (Held On 04 Sep 2022)
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  2. 1

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Option 3 :
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We have,

Put x = 1, y = 2, z = 3

⇒  

⇒ 

⇒ 

From option (3), 

∴  is the correct value. 

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