InterviewSolution
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InterviewSolution
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If a, b, c and d are four positive real numbers such that sum of a, b and c is even the sum of b,c and d is odd, then `a^2-d^2` is necessarilyA. oddB. EvenC. PrimeD. Either (a) or (b) |
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Answer» Correct Answer - A (i) Subtract one condition from another and proceed. (ii) `(a+b+c)-(b+c+d)=` even-odd `rArr a-d` is odd. (iii) `a+d` is also odd. |
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