Question

how many two digit numbers are there not having digit 4?​

Answer 1

Answer:

72

Step-by-step explanation:

Between 10 and 99 there are 90 numbers

There are 18 numbers which have 4

So 90-18=72

Answer 2

Answer:

72

Step-by-step explanation:

There are 90 two digit numbers between 10 and 99.

$(99 - 10) + 1 \\ = 90$

Digits which having '4' are 14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94. You can count, it's 18. There are 18 digits which contains '4'.

So there is

$90 - 18 = 72$

digits which doesn't contains 4.

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