# NCERT Exemplar Solutions Class 6 Mathematics Solutions for Exercise in Chapter 1 - Number System

Question 3 Exercise

The largest 4-digit number, using any one digit twice, from digits 5, 9, 2 and 6 is

(A) 9652

(B) 9562

(C) 9659

(D) 9965

(D) 9965

Using 9 as twice from 5, 9, 2 and 6, then then number is 9965.

Video transcript
"hello students welcome to lido homework let us start solving the question that's given on our screen today it reads find the mean of all the factors of 10. so let us first understand what is a factor a factor is a number which divides a given number completely giving a remainder 0 okay so all the factors such factors of 10 we need to find out with all the factors will equal will always divide 10 you get the remainder 0 only so the 1 1 factor of 10 is 1 so let me just write factors of 10 r okay so one thing is very clear factor of any number is 1 and itself for sure so let us first write 1 and 10. to find the other factors we can prime factorize them okay so this is how we prime factorize okay so i take 10 over here and then we prime factorize it as two 5 10 now since you get the prime number here you cannot further factorize so 2 and 5 are also the factors of 10 one itself and after prime factorization whatever numbers you get are also the factors okay so we have four factors of 10 okay now uh let us find the mean as we know the formula for mean is sum of the values by total number of count okay so let me write sum by number of counts okay so sum can be written as 1 plus 10 plus 2 plus 5 divided by number of counts are how many 1 2 3 4 so 4 counts okay so when you add the numerator you get the value as 18 divided by 4 which further equals 4.5 which is the mean or the average of all the factors of 10. okay i hope it's clear if you still have any doubt put a message in the comment section and subscribe to our channel for regular updates bye"
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