5 Replies
@Apu
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.2003 in binary is 11001011111. Now for any k_th digit number where k<11, it is easy to find by symmetry the number of such numbers.
As for 11-digit numbers, you'll have to case-work a bit.
oh i got it
thanks
+solved @SirLancelotDuLac
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