InterviewSolution
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InterviewSolution
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यदि `a+b=1, c+d=1` और `a-b=d/c` है तो `c^(2)-d^(2)` का मान क्या होगा?A. `a/b`B. `b/a`C. `1`D. `-1` |
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Answer» Correct Answer - B `a+b=1` `c+d=1` `a-b=d/c` or `1/(a-b)=c/d` `(a+b)/(a-b)=c/d( :. a+=1)` by C & D rule `implies ((a+b)-(a-b))/((a+b)-(a-b))=(c+d)/(c-d)` `implies (2a)/(2b)=(c+d)/(c-d)` `implies a/b=(c+d)/(c-d)` Now multiply & divide by `(c+d)` `a/b=((c+d))/((c-d))xx((c+d))/((c+d))=((c+d))/(c^(2)-d^(2))` `implies a/b=((c+d)^(2))/((c^(2)-d^(2)))` `c+d=1` `a/b=1/(c^(2)-d^(2))` `c^(2)-d^(2)=b/a` |
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