What percentage of numbers from 1 to 70 have squares that end in the digit 1?
(a)
1
(b)
14
(c)
20
(d)
21
What percentage of numbers from 1 to 70 have squares that end in the digit 1?
(a)
1
(b)
14
(c)
20
(d)
21
Question ID - 56681 | SaraNextGen Top Answer
What percentage of numbers from 1 to 70 have squares that end in the digit 1?
(a)
1
(b)
14
(c)
20
(d)
21
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What percentage of numbers from 1 to 70 have squares that end in the digit 1? |
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(a) |
1 |
(b) |
14 |
(c) |
20 |
(d) |
21 |
|
1 Answer
127 votes
Answer Key / Explanation : (c) -
Clearly, the numbers which have 1 or 9 in the unit’s digit, have squares that end in the digit 1. Such numbers from 1 to 70 are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69.
Number of such numbers = 14.
Required percentage = 
127 votes
Answer Link
127