In How Many Ways Can A Lock Be Opened If That Lock Has Three Digit Nu

1.	In How Many Ways Can A Lock Be Opened If That Lock Has Three Digit Number Lock If I) The Last Digit Is 9 Ii) And Sum Of The First Two Digits Is Less Than Or Equal To The Last Digit
Answer» our number is xy9 now if x is 0 then y has 10 OPTIONS now if x is 1 then y has 9 options (except 9) now if x is 2 then y has 8 options (except 9 and 8) . . . now if x is 9 then y has 1 OPTION (that is 0) our number is xy9 now if x is 0 then y has 10 options now if x is 1 then y has 9 options (except 9) now if x is 2 then y has 8 options (except 9 and 8) . . . now if x is 9 then y has 1 option (that is 0)

In How Many Ways Can A Lock Be Opened If That Lock Has Three Digit Number Lock If I) The Last Digit Is 9 Ii) And Sum Of The First Two Digits Is Less Than Or Equal To The Last Digit

Answer»

our number is xy9

now if x is 0 then y has 10 OPTIONS

now if x is 1 then y has 9 options (except 9)
now if x is 2 then y has 8 options (except 9 and 8)
.
.
.

now if x is 9 then y has 1 OPTION (that is 0)

our number is xy9

now if x is 0 then y has 10 options

now if x is 1 then y has 9 options (except 9)
now if x is 2 then y has 8 options (except 9 and 8)
.
.
.

now if x is 9 then y has 1 option (that is 0)