This a very simple question. What is 2^2006, is the last digit 8? See I am a very stupid and dumb person so please if you do insult me, it just won't work. Okay I have already come to that reality, everybody has told me.
Originally posted by Knight Square All I wanted to know if it the number ended with 8 and it didn't thank you
You can save a bit of a time by using the fact that 6*6=36, or any number ending with a 6 when multiplied by a number ending in 6 will give you a number ending in 6.
Originally posted by ThudanBlunder I used a program called Mathematica.
2^n ends in 8 only when n is of the form 4k+3
eg,
k = 0 gives n = 3 and 2^n = 2^3 = 8
k = 1 gives n = 7 and 2^n = 2^7 = 128
k = 2 gives n = 11 and 2^n = 2^11 = 2048
etc.
Then you don't get an 8 till you reach 2^2011 I think.
2011-3 = 2008, evenly divisible by 4. Right?
K has restrictions also, right? Only positve natural numbers.
if the question was of the form "
is the last digit of the answer to 2^2006 = 8" and you had no idea whatsoever as to the answer, then a betting man would say "no" - since there are 10 different digits the last number could be (0-9).
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Originally posted by Alcra if the question was of the form "
is the last digit of the answer to 2^2006 = 8" and you had no idea whatsoever as to the answer, then a betting man would say "no" - since there are 10 different digits the last number could be (0-9).
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But 2^x (where x is a positive integer) can only end with the digits 2,4,8 or 6.