- 2 6. How many 7-digils numbers are there in all? – InterviewSolution

1.	- 2 6. How many 7-digils numbers are there in all?
Answer» -step explanation:There are 18 two digit numbers containing 7. SOLUTION: 7 is a unit digit and if we add 10 with it, it RESULTS a two digit number 17, just by changing the digit in the tenth PLACE, contains 7.

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