Question

how many numbers are there between 100 and 1000 such that atleast one of their digit is 7​

Answer 1

Answer:

Numbers between 100 and 1000=900

Numbers between 100 and 1000 which do not have digit 7 at any place =8×9×9=648

Therefore,

Numbers between 100 and 1000 which have at least one digit as

7=900−648=252

Hence there are 252 numbers in between 100 and 1000 such that at least one of their digit is 7.

Step-by-step explanation:

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Answer 2

Answer:

there are 250 numbers between 100&1000 such that at least one of their digit is 7