Ritika wants to type the first 160 natural numbers. The number of times she has to press thenumbered keys i

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

A typist starts to type the serial numbers of candidates in a list, upto 500. Minimum how many times does he need to press the keys of numerals only?

A game was conducted in a typewriting class, where a candidate has to type/enter all the three-digit numbers without space. If made a mistake while typing, the candidate can use the backspace key once for one three-digit number. What is the least number of times a candidate has to press the keys to type all the three-digit numbers? (Assuming the candidate did not make any mistake)

There is a standard numeric keypad on a mobile phone. You can only press the current button or buttons that are directly up, left, right, or down from it (for ex if you press 5, then pressing 2, 4, 6 & 8 are allowed). Diagonal movements and pressing the bottom row corner buttons (* and #) are prohibited.Given a number n, find the number of possible unique sequences of length n that you can create by pressing buttons. You can start from any digit.

If you write down all the numbers from 1 to 100, then how many times do you write 3 ?Options11202118