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January 31, 2015

January 31, 2015

Posted by **MONICA** on Saturday, November 26, 2011 at 5:54pm.

The answer I came up with is 163840000000 x10 ~1.64E11 is this correct if not please help.

- ALGEBRA -
**Reiny**, Saturday, November 26, 2011 at 8:23pmI counted 40 possible symbols that can be used in each of the 7 places

number of such cases = 40^7 , assuming that repetition is allowed.

But it also includes the case of 7 spaces, which technically would be a blank plate. I don't think they would allow that

number of way = 40^7 - 1

Your answer is correct as 1.64 x 10^11

(subtracting my 1 has no effect on such a huge number)

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