What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?
Answers
Answered by
8
The answer is 20.
Reason:-
The numbers which have 1 or 9 in the unit's digit, have squares that end in the digit 1.
There are about 14 such numbers from 1 to 70 i.e. 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69.
Hence,required percentage = 14/70 x 100 = 20%
Reason:-
The numbers which have 1 or 9 in the unit's digit, have squares that end in the digit 1.
There are about 14 such numbers from 1 to 70 i.e. 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69.
Hence,required percentage = 14/70 x 100 = 20%
Answered by
11
Numbers having 1 or 9 from 1 to 70 =14 numbers (1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69.)
Total numbers = 70
Percentage of such numbers = (14/70) x 100 % = 20%
Total numbers = 70
Percentage of such numbers = (14/70) x 100 % = 20%
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