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# How many digits will be there in 2^18*5^17

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Manager
Joined: 07 May 2007
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How many digits will be there in 2^18*5^17 [#permalink]

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13 Jun 2007, 19:38
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

How many digits will be there in 2^18*5^17?
Manager
Joined: 23 Dec 2006
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13 Jun 2007, 20:00
2^18*5^17 = (2*5)^(18+17)=10^35

35.
VP
Joined: 10 Jun 2007
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13 Jun 2007, 20:08
sludge wrote:
2^18*5^17 = (2*5)^(18+17)=10^35

35.

Hey man, this is incorrect. 2^18 * 5^17 doesn't equal to (2*5)^(17+18).
Here is what I have:

2^18 * 5^17 = 2 * 2^17 * 5^17 = 2 * (2 * 5)^17 = 2 * 10^17
Therefore, 18 digits.
Manager
Joined: 23 Dec 2006
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13 Jun 2007, 20:17
Oops thanks for the correction
13 Jun 2007, 20:17
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# How many digits will be there in 2^18*5^17

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