Ask Questions, Get Answers

Want to ask us a question? Click here
Browse Questions
Home  >>  CBSE XI  >>  Math  >>  Permutations and Combinations
0 votes

How many 10 digit numbers can be written using digits (9 and 2) ?

$\begin{array}{1 1}(A)\;10C_1+9C_2\\(B)\;2^{10}\\(C)\;10C_2\\(D)\;10!\end{array} $

Can you answer this question?

1 Answer

0 votes
Total number of numbers =$2\times 2.....\times 10$ times
$\Rightarrow 2^{10}$
Hence (B) is the correct answer.
answered Jun 20, 2014 by sreemathi.v

Related questions

Ask Question
student study plans
JEE MAIN, CBSE, AIPMT Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App