2. How many numbers are there between 100 and 1000 such that (i) every digit is either 2 or 5 (ii) digit at unit’s place is 5

Question

2. How many numbers are there between 100 and 1000 such that
(i) every digit is either 2 or 5
(ii) digit at unit’s place is 5
(iii) atleast one digit is 5
(iv) exactly one digit is 5​

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Quinn 1 month 2021-09-14T23:42:36+00:00 1 Answer 0 views 0

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    2021-09-14T23:43:36+00:00

    Answer:

    Each one of the unit’s ten’s and hundred’s places can be filled in 2 ways. Hence, the required number of numbers =(2×2×2)=8.

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