Question

(2/5)^n×(2/5)^-3=(2/5)^7​

Answer 1

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Answer 2

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Answer

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2n−7×5n−4=1250

2n−7×5n−7×53=1250

⇒(2×5)n−7=1251250

⇒10n−7=101

⇒n−7=1

⇒n=7+1=8