If bc + cd = 2bd and a + c = 2b, then which one of the following is correct?
Answer
Correct Answer : c ) ad - bc = 0
Explanation :Given that,
bc + cd = 2bd ....(1)
a + c = 2b ....(2)
We can notice that in eq. 1 RHS, there is 2b and we can replace 2b from eq. 2 in eq. 1, we get,
bc + cd = (a + c)d
bc + cd = ad+ cd
bc = ad
ad - bc = 0
Therefore, (c) is the correct answer.
This question was asked in UPSC CDS 2 2022 Exam, you can check cds answer key released by PendulumEdu.
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