Ultmee&istinctlettersof the English alphabetsare there?5 How many numb

1.	Ultmee&istinctlettersof the English alphabetsare there?5 How many numbers are there between 100 and 1000 such that 7 is in the units n
Answer» Here there three places which are to be filled with numbers upto { 1.............9 ,0} And the unit place is already occupied by 7 So the digit at tens place can be filled in 10 ways . And the digit At hundred place can be filled in 9 ways , as 0 can not be there . Hence the numbers are 10 *9 = 90 numbers which have 7 at unit place . Like my answer if you find it useful!

Ultmee&istinctlettersof the English alphabetsare there?5 How many numbers are there between 100 and 1000 such that 7 is in the units n

Answer»

Here there three places which are to be filled with numbers upto { 1.............9 ,0}

And the unit place is already occupied by 7

So the digit at tens place can be filled in 10 ways .

And the digit At hundred place can be filled in 9 ways , as 0 can not be there .

Hence the numbers are 10 *9 = 90 numbers which have 7 at unit place .

Like my answer if you find it useful!