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12 Nov 2025, 00:21
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D
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Difficulty:
45%
(medium)
Question Stats:
55% (01:05) correct
45%
(01:22)
wrong
based on 53
sessions
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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
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
