Consider numbers from 1-999. (There is no digit five in number 1000). Numbers that has unit place digit =5: Digits possible in hundred's place are (0,1,2,3,4,5,6,7,8 and 9). Select one digit out of these 10 digits in 10C1 ways=10. Similarly, digits possible in ten's place are (0,1,2,3,4,5,6,7,8 and 9). Select one digit out of these 10 digits in 10C1 ways. Number of numbers with unit place digit is 5 = 10C1 × 10C1 ×1 =100. Similarly, number of numbers with ten's place digit is 5 = 10C1 × 1 × 10C1=100. And number of numbers with hundred's place digit is 5 = 1×10C1×10C1=100. Total digit five = 100+100+100=300
Isme only 100th place wala five count Kiya hai means jo pehle a Raha hai jese 555 mai only pehla five count hoga 2nd five 10th place mai count ho chuka hai and 3rd five unit place par already count kr rkha hai isliye
Consider numbers from 1-999. (There is no digit five in number 1000). Numbers that has unit place digit =5: Digits possible in hundred's place are (0,1,2,3,4,5,6,7,8 and 9). Select one digit out of these 10 digits in 10C1 ways=10. Similarly, digits possible in ten's place are (0,1,2,3,4,5,6,7,8 and 9). Select one digit out of these 10 digits in 10C1 ways. Number of numbers with unit place digit is 5 = 10C1 × 10C1 ×1 =100. Similarly, number of numbers with ten's place digit is 5 = 10C1 × 1 × 10C1=100. And number of numbers with hundred's place digit is 5 = 1×10C1×10C1=100. Total digit five = 100+100+100=300.
Consider numbers from 1-999. (There is no digit five in number 1000).
Numbers that has unit place digit =5:
Digits possible in hundred's place are (0,1,2,3,4,5,6,7,8 and 9). Select one digit out of these 10 digits in 10C1 ways=10.
Similarly, digits possible in ten's place are (0,1,2,3,4,5,6,7,8 and 9). Select one digit out of these 10 digits in 10C1 ways.
Number of numbers with unit place digit is 5 = 10C1 × 10C1 ×1 =100.
Similarly, number of numbers with ten's place digit is 5 = 10C1 × 1 × 10C1=100.
And number of numbers with hundred's place digit is 5 = 1×10C1×10C1=100.
Total digit five = 100+100+100=300
Best solution
USE FORMULA (N * 10 POWER N-1) where N is the number of zeros so here it will be 3 zeros in thousand.
Thank you for giving the best solution and also very grateful to you for teaching in English 😇
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sir why you counted 55 two times ? PS -> Thank u for csat initiative.
In number 55, the digit five occurs in both unit's place and the hundred's place.
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Thank you
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Thanks for giving the best solutions 🙏🙏🥰
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Superb.
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Tuch mastt sangitl bhau khup khup dhanywad
Thank you sir
550-559 m two times repeat ho rha vo add ni hoga ?
Isme only 100th place wala five count Kiya hai means jo pehle a Raha hai jese 555 mai only pehla five count hoga 2nd five 10th place mai count ho chuka hai and 3rd five unit place par already count kr rkha hai isliye
What if the number replaced by other than 5,will get same numbers?
Except for digits 0 and 1 the result is same.👍
@@AbdusCSATMATH sir how about 1 ? can you explain it. I sthe process the same ?
@@janeniaaguilar6542 yes,
1-999 , 300 digit 1 are there,
In thousand one more digit 1,
Then total = 300+1 =301
Super sir.. Can we do with the same method if they are asking like digit 2 is coming???
Yes
In the number 55 there r 2 fives so u counted wrong and what is the difference between a number and a digit
🤕🤕🤕
It's consumes more time to go this lengthy method
Try to explain more question in 1 video.
Sir please reply😞😞😞....sir how 20*10? I think 20*9!
1-100
101-200
201-300
301-400
401-500
501-600
601-700
701-800
801-900
901-1000
Total ten sets are there 😊
Easy method but time consuming
You made it more complicated. Waste of time.
Consider numbers from 1-999. (There is no digit five in number 1000).
Numbers that has unit place digit =5:
Digits possible in hundred's place are (0,1,2,3,4,5,6,7,8 and 9). Select one digit out of these 10 digits in 10C1 ways=10.
Similarly, digits possible in ten's place are (0,1,2,3,4,5,6,7,8 and 9). Select one digit out of these 10 digits in 10C1 ways.
Number of numbers with unit place digit is 5 = 10C1 × 10C1 ×1 =100.
Similarly, number of numbers with ten's place digit is 5 = 10C1 × 1 × 10C1=100.
And number of numbers with hundred's place digit is 5 = 1×10C1×10C1=100.
Total digit five = 100+100+100=300.
Sir I could not understand this
How many times digit will 5 appear while writing 1 to 1000.
5, 15, 25, 35,45,55.....995
Count all the digit 5, it’s equal to 300.