প্রথম অংক


The $2021$ number is written in such a way that the number with any two consecutive numbers is divisible by either $17$ or $23.$ If the last digit is $7,$ what is the first digit?


Number Theory   BdMO  


  0 Upvote                    1 Downvote

Statistics



Attempt 356


Solve 309


First Solve Mesbatur_Rahman_Niloy