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alex.gellatly
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4^11 = 2^22 = 2*(2^21)alex.gellatly wrote:If 5^21 * 4^11 = 2*10^n, what is the value of n?
(5^21)*(4^11) = (5^21)*2*(2^21) = 2*(2*5)^21 = 2*(10^21)
Hence, n = 21
The correct answer is B.
