How many 4-digit numbers cannot be divided by 5?

Four digit number can be formed using 0,1,2,3,4,5,6,7,8,9

Any number which ends with 0 or 5 is divisible by 5.

_ _ _ _ We have to check for 4 digit numbers. The 4 digit number must end with 0 or 5.

So the number at the thousandth place can be written in 9 ways (since 0 can not be written at thousandth place) = 9

the number at the hundredth place can be written in 10 ways = 10

the number at the tenth place can be written in 10 ways = 10

the number at the unit place can be written in 2 ways = 2

So the number of ways the 4 digit number can be written as (9)(10)(10)(2) = 1800 ways.

For total number of ways:

the number at the thousandth place can be written in 9 ways = 9

the number at the hundredth place can be written in 10 ways = 10

the number at the tenth place can be written in 10 ways = 10

the number at the unit place can be written in 10 ways = 10

Total number of ways = (9)(10)(10)(10) = 9000 ways

So the number of ways the 4 digit number can be written that can be divisible by 5 = Total number of ways - number of ways the 4 digit number can be written

The number of ways the 4 digit number can be written that can be divisible by 5 = 9000 - 1800 = 7200 ways

the first option i believe

step-by-step explanation:

нιѕ яαтє ιѕ 1/4 σя .25 ριєѕ ρєя мιиυтє

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