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Posted by **cassie** on Sunday, February 20, 2011 at 10:14pm.

19)

15 to base two

19)

______

A)

11110two

B)

111two

C)

1110two

D)

1111two

- Math for teachers -
**Reiny**, Monday, February 21, 2011 at 8:28am19 = 16 + 2 + 1

= 2^4 + 0(2^3) + 0(2^2) + 2^1 + 2^0

= 10011_{2}

aRgghh!, just realized that 19 was the question #

but let's leave it as another example

15 = 8 + 4 + 2 + 1

= 2^3 + 2^2 + 2^1 + 1

= 1111_{2}

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