1.

If x and y are positive number such that (y)x = 441, then what is the value of (y – x)(y + x)/2 1. 1923/ 2 2. 1423/2 3. 1511/2 4. 1719/2

Answer» Correct Answer - Option 1 : 1923/ 2 

(y)x = (21)2

So, y = 21 and x = 2

(21 – 2)(21 + 2)/2

⇒ 19(23/2) 



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