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08 Apr 2024, 23:47
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Difficulty:
55%
(hard)
Question Stats:
58% (01:46) correct
42%
(01:45)
wrong
based on 112
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How many integers between 360 and 630 are there such that they have odd number of divisors?
A. 3
B. 4
C. 5
D. 6
E. 7
A. 3
B. 4
C. 5
D. 6
E. 7
08 Apr 2024, 23:51
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Only perfect squares have odd number of factors/divisors(You can look up on Google as to why that's the case)
So we need to find the number of perfect squares between 360 and 630.
The first perfect square in the range in square of 19(361) and the last perfect square in that range is the square of 25(625).
So total number of perfect squares are all the squares of integers from 19-25.
So answer is 7.
Posted from my mobile device
So we need to find the number of perfect squares between 360 and 630.
The first perfect square in the range in square of 19(361) and the last perfect square in that range is the square of 25(625).
So total number of perfect squares are all the squares of integers from 19-25.
So answer is 7.
Posted from my mobile device
29 Sep 2025, 05:38
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