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pooja meena

· started a discussion

· 1 Months ago

tyist (Question:616883.0)

could not understand solution

Question:
A typist starts to type the serial numbers of candidates in a list, up to 500. Minimum how many times he has to press the keys of numerals only?
Options:
A) 1389
B) Less than 1000
C) 1392
D) Can’t say
Solution:

Ans: (c)  

For one digit number 1 × 9 = 9

(No. of single digit numbers are 9)

For two digit numbers 2 × 90 = 180

(No. of 2 digit numbers from 10 to 99 are 90)

For three digit numbers up to 500 = 3 × 401 = 1203

(No. of 3 digit numbers from 100 to 500 are 401)

Thus the required value = 9 + 180 + 1203= 1392.

Abhinav Sinha

· commented

· 1 Months ago

Dear student
We have updated the solution,
please check.
For one digit number 1 × 9 = 9
(No. of single digit numbers are 9)
For two digit numbers 2 × 90 = 180
(No. of 2 digit numbers from 10 to 99 are 90)
For three digit numbers up to 500 = 3 × 401 = 1203
(No. of 3 digit numbers from 100 to 500 are 401)
Thus the required value = 9 + 180 + 1203= 1392.

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