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12 Nov 2025, 00:21
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
51% (01:16) correct
49%
(01:18)
wrong
based on 96
sessions
History
Date
Time
Result
Not Attempted Yet
How many non-negative integers less than 81 are NOT equal to squares of non-negative integers ?
(A) 9
(B) 70
(C) 71
(D) 72
(E) 73
(A) 9
(B) 70
(C) 71
(D) 72
(E) 73
ankushsambare
Joined: 13 Jun 2022
Last visit: 09 May 2026
Posts: 105
Given Kudos: 103
Location: India
Schools: ISB '27 Wharton '26 INSEAD Aug '26
GPA: 2.4
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12 Nov 2025, 01:05
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Total integers = 0 to 80 → 81 numbers.
Perfect squares ≤ 80 are 02, 12, 22, ..., 82 → 9 numbers.
Consider "0" as 0 is non-negative number.
Non-squares = 81 − 9 = 72.
Answer: D
Perfect squares ≤ 80 are 02, 12, 22, ..., 82 → 9 numbers.
Consider "0" as 0 is non-negative number.
Non-squares = 81 − 9 = 72.
Answer: D
12 Nov 2025, 01:06
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How many non negative integers are not equal to the square of an integer = What is the total number of non-negative integers <81 - the Squares of non-negative integers?
Total number = 81 (0 included)
Subtracted numbers:
0^2 = 0
1^2 = 1
2^2 = 4
...
Highest is 8^2 = 64, as 9^2 is out of bounds.
0-8 -> 9 numbers.
81 - 9 = 72
ANS: D
Total number = 81 (0 included)
Subtracted numbers:
0^2 = 0
1^2 = 1
2^2 = 4
...
Highest is 8^2 = 64, as 9^2 is out of bounds.
0-8 -> 9 numbers.
81 - 9 = 72
ANS: D
