A typist started typing the serial numbers of 600 students in a list, then how many times he has to press the numeric keys?180016891692600
Question
Solution 1
The typist has to type the serial numbers of 600 students.
Let's break it down:
For students 1 to 9, he will press the numeric key once, so that's 9 keys.
For students 10 to 99, he will press the numeric key twice, so that's 90 students * 2 = 180 keys.
For students 100 to 599, he will Knowee AI StudyGPT is a powerful AI-powered study tool designed to help you to solve study prob
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