A popular website requires users to create a password consisting of digits only. If no digit may be repeated and each password must be at least 9 digits long, how many passwords are possible ?

A 9!+10!
B 2×10!
C 9!×10!
D 9!

Correct Answer: 2×10!

এখানে , 0,1,2,3,5,6,7,8,9 9 মোট 10 ডিজিট । এই 10 ডিজিট থেকে 9 ডিজিট পাসওয়ার্ড পাওয়া যায়। 10×9! = 10!  উপায়ে আবার, 10 ডিজিট থেকে 9 ডিজিট পাসওয়ার্ড বাছাই করা যায় = 10P9 = 10!1! = 10! মোট উপায় = 10! + 10! = 2×10!
Bissoy MCQ
#গণিত #Global Islami Bank #প্রবেশনারি অফিসার | 02-04-2022

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