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Q.

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

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a

$^{10} C_{2} +^{9} C_{2}$

b

$2^{9}$

c

$2^{10} - 2$

d

$10!$

answer is B.

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Detailed Solution

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

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