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2016-11-13 (13 Nov) (Shift-1)
Question 79 of 100
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100
If (a/b)ˣ⁻¹ = (b/a)ˣ⁻³, then the value of x is:
A
1/2
B
1
C
2
D
7/2
Correct Option:
C
Explanation
(a/b)^(x−1) = (b/a)^(x−3) = (a/b)^(3−x). Thus, x−1 = 3−x, so 2x = 4 and x = 2.
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