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B
2
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C
4
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D
3
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Solution
The correct option is C2 As given 25x−1=4×23x+1 ⇒25x−1=22×23x+1 ⇒25x−1=23x+1+2 ⇒25x−1=23x+3 Now we have equation for x ⇒5x−1=3x+3 ⇒5x−3x=3+1 ⇒2x=4 ⇒x=2