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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 |
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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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