How many 10 digit numbers can be formed using digits 1 and 9?
a. 10!
b. 10^2
c. 2^10
d. none of these?
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answer is : d . none of these .
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Answer:
2^10
Step-by-step explanation:
there are 10 places to fill using 1 and 9, and we can place either 1 or 9 in each place
hence we have 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2
= 2^10
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