Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

JEE Class main Answered

Sir pls solve the following.
question image
Asked by rsudipto | 30 Dec, 2018, 08:50: PM
answered-by-expert Expert Answer
This knind of question should mention whether repetition of digits is allowed or not.
It is mentioned ' all possible order ". So I thought repetition is allowed, but when i work out the question,  answer is not matching.
When I assume repetition is not allowed i got the matching answer.
 
hence this question is worked out by assuming repetition is not allowed.
 
When the digits are not repeated there are 4! ways or 24 ways to form 4 digit numbers.
Each digit appears equal number of times in all the places. Hence each digit will appear 24/4 = 6 times in each place.
 
sum of digits = 1+2+4+6 = 13
 
hence sum of all numbers = 6×13×(1000+100+10+1) = 86658 
Answered by Thiyagarajan K | 31 Dec, 2018, 02:49: PM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
JEE main - Maths
let (-2-i/3) ^3
question image
Asked by priyadharshinigopinath27 | 03 May, 2024, 08:44: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Maths
maths sum
question image
Asked by keerthananukala2007 | 02 May, 2024, 11:32: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Maths
I didn't understand thid
question image
Asked by amrutmasaguppi1108 | 01 May, 2024, 11:10: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Maths
the probability of attending a conference is 0.5, and the probability of attending a workshop is 0.3. if 40% of conference attendees also attend workshops, what is the probability that a student attends a workshop given that they attended a conference?
Asked by ms9876tr | 28 Apr, 2024, 12:05: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Maths
a+bx e power of y/x =x then d square y by dx square
Asked by jameelmohd765 | 27 Apr, 2024, 10:23: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Maths
find
question image
Asked by komuravellysravanthi4 | 26 Apr, 2024, 02:14: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Maths
solution please
question image
Asked by piyurawriya | 24 Apr, 2024, 12:46: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Maths
answer
question image
Asked by piyurawriya | 23 Apr, 2024, 02:02: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Maths
let M be the skew symmetric orthogonal real matrix.Then only possible eigen values are
Asked by kakumanumanoj282 | 20 Apr, 2024, 06:07: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Maths
sin-1(sin5π/3)
Asked by nirmalraulji5 | 18 Apr, 2024, 09:03: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×