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JIGAR SHAH

· started a discussion

· 1 Months ago

ans is 20 (Question: 88299.0 )

1 10 11 12 13 14 15 16 17 18 19 21 31 41 51 61 71 81 91 100
in your solution 11 no is counted two time. at unit place and tens place 11 should counted for 1 time.

Question:

How many times would the number “1” be written while listing the integers from 1 to 100?

Options:
A) 18
B) 19
C) 20    
D) 21
E) None of these
Solution:

Ans(d); 

Number of 1 at unit place = 10

Number of 1 at ten's place = 10

Number of 1 at hundred's place=1

Required number of 1 = 10+10+1=21

kanhaiya jha

· commented

· 1 Months ago

Not at all...when we see 1 two times in 11 then why will we not count it twice...it must be counted twice because here the question has been asked is "How many times would the number “1” be written while listing the integers from 1 to 100?"...

so,

Number of 1 at unit place = 10

Number of 1 at ten's place = 10

Number of 1 at hundred's place=1

Required number of 1 = 10+10+1=21
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