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NCERT Exemplar Solutions Class 6 Mathematics Solutions for Exercise in Chapter 1 - Number System
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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
Answer:
(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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