The number of 10 digit numbers that can be written by using the digits 0 and 1 is

The number of 10 digit numbers that can be written by using the digits 0 and 1 is

A
$^{10} C_{2} +^{9} C_{2}$
B
$2^{9}$
C
$2^{10} - 2$
D
$10!$

Solution:

For each place we have two choices: either use $0$ or use $1 .$

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