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a = 4/39. What is the value of 10^6a - a?

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a = 4/39. What is the value of 10^6a - a?

by Max@Math Revolution » Thu Jul 16, 2020 11:29 pm

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[GMAT math practice question]

a = 4/39. What is the value of 10^6a - a?

A. 10,2500
B. 102,510
C. 102,555
D. 102,564
E. 102,573
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Re: a = 4/39. What is the value of 10^6a - a?

by Max@Math Revolution » Sun Jul 19, 2020 6:13 pm
=>

10^6a - a = a(10^6 - 1) = 4/39 · 999,999 = 4/13 · 333,333
= 4 · 25641 = 102,564

Therefore, D is the correct answer.
Answer: D
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