यदि है, तो A4 का मान क्या है?

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NDA (Held On: 23 April 2017) Maths Previous Year paper
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Option 1 :
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UPSC NDA 01/2025 General Ability Full (GAT) Full Mock Test
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संकल्पना:

दिया गया है: 

अब,

अतः विकल्प 1 सही उत्तर है। 

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