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Given 102y = 25
⇒ (10y)2 = 52
⇒ (10y) = 5
⇒ (10y)-1 = (5)-1
∴ 10-y = (5)-1 = 1/5 ans.
⇒ (10y)2 = 52
⇒ (10y) = 5
⇒ (10y)-1 = (5)-1
∴ 10-y = (5)-1 = 1/5 ans.
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