Verbal Reasoning - Arithmetic Reasoning - Discussion

Discussion :: Arithmetic Reasoning - Section 1 (Q.No.24)

24. 

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

[A]. 11
[B]. 18
[C]. 20
[D]. 21

Answer: Option C

Explanation:

Clearly, from 1 to 100, there are ten numbers with 3 as the unit's digit- 3, 13, 23, 33, 43, 53, 63, 73, 83, 93; and ten numbers with 3 as the ten's digit - 30, 31, 32, 33, 34, 35, 36, 37, 38, 39.

So, required number = 10 + 10 = 20.


Mounika said: (May 25, 2011)  
Here 4m 1 to 10 , we clearly have

10 no's:3,13,23,33,43,53,63,73,83,93

and more 9 no's:30,31,32,34,35,36,37,38,39

Since we have calculated 33 already need not count here .

Hence answer is 19.

Senthilkumar said: (Jun 18, 2011)  
NO the answer was 20 because in 33 we wrote down 3 in two times so 20 is the right answer but here they mistakenly said 33 two times

Ashish said: (Aug 10, 2011)  
Yes the answer should be 19.

Sundar said: (Aug 11, 2011)  
@All

The correct answer is 20.

03, 13, 23, 43, 53, 63, 73, 83, 93 = 9 3s are there

30, 31, 32, 34, 35, 36, 37, 38, 39 = 9 3s are there

33 = 2 3s are there

Total = 9 + 9 + 2 = 20.

Paulwin Jerome said: (Feb 2, 2015)  
3, 13, 23, 33, 43, 53, 63, 73, 83, 93 = Eleven 3's.

30, 31, 32, 34, 35, 36, 37, 38, 39 = Nine 3's.

Therefor 11 + 9 = 20.

Almojeed said: (Nov 19, 2016)  
It's wrong, because 33 was counted twice. Therefore, the answer is 19.

Shravan Sharma said: (Feb 7, 2017)  
The correct answer is 19.

10 times from 30 to 39 and rest 9 from 3, 13, 23, 43, 53, 63, 73, 83, 93.

Lokesh Sanam said: (May 8, 2017)  
Why to count 33 two times? Please explain it.

Siyad said: (Jun 13, 2017)  
@Mounika @Ashish @Almojeed @Shravan Sharma @Lokesh Sanam.

The answer is Option [C]. 20.

In 33, we have to write 3 twice.

Hope you will understand.

Mark John Ureta said: (Feb 12, 2018)  
Treat 3 as ones digit different to 3 use as a tens digit.

Vishwajeet said: (Feb 27, 2018)  
33 is counted double.

Answer should be 19.

Himanshu Kumar Tiwari said: (Aug 25, 2018)  
The Right answer is 19.

Nisha Pawar said: (Sep 1, 2018)  
The Right answer is 20. I agree.

Digvijay said: (Dec 22, 2018)  
@Sundar you're right.

In 33 we write 3 two times.

Pankaj said: (Jan 5, 2019)  
20 because 33 has 2 3's.

Neeraja said: (Jul 14, 2020)  
Thanks @Sundar.

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