the arithmetic mean of the nine numbers in the given set (9,99,999......999999999) is a 9 digit number N all whose digits are distinct .The number N does not contain the digit
A) 0
B) 2
C) 5
D) 9
Answers
Answered by
2
a it is correct man ok it is right
Answered by
19
Number N does not contain the digit 0.
Solution:
The arithmetic mean also means average therefore the average of 9 digits that is from 9,99,999......999999999
The formula to find out the arithmetic mean or average of the numbers is
n = Number of the terms in the series = 9
x = term to be averaged
i = 1, 2, 3……..
A is the arithmetic mean of the series.
Putting the values in
Now as for the sum of 9, 99, 999......999999999 we can find the sum by using,
9 (1 + 11 + 111 + ………… + 111111111) = 9(123456789).
Therefore, Average number = 123456789
After finding the average we get the value 123456789 from which we can say that the number does not contain any 0 therefore the digit not present in the value of N is zero, i.e. OPTION A.
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