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# 5^21) x (4^11) = 2 X (10^n) What is n? 11, 21, 22, 23, 32

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5^21) x (4^11) = 2 X (10^n) What is n? 11, 21, 22, 23, 32 [#permalink]  23 Oct 2007, 08:07
(5^21) x (4^11) = 2 X (10^n) What is n?

11, 21, 22, 23, 32

What is the best method for solving this? Is there a trick to narrow down the unit's digit?
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Re: Exponents Problem GMAT Prep Test 1 [#permalink]  23 Oct 2007, 08:15
tlauber wrote:
(5^21) x (4^11) = 2 X (10^n) What is n?

11, 21, 22, 23, 32

What is the best method for solving this? Is there a trick to narrow down the unit's digit?

(5^21) x (4^11) = (5^21) x (2^22) = 2 x (5^21) x (2^21)
= 2 x 10^21
Re: Exponents Problem GMAT Prep Test 1   [#permalink] 23 Oct 2007, 08:15
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