the answer is 8 I need the process and if anyone write anything unnecessary to get points I will report that answer
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1250 = 2×5×5×5×5= 2× 5^4
2^n-7 x 5^n-4 = 2^1 × 5^4
2^n-7 = 2^1 and 5^n-4 = 5^4
n-7 = 1 and n-4 =4
Therefore n=8
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