Question

find the least square number which is exactly divisible by 5,15,and6-
(a) 800
(b) 625
(c) 256
(d) 900
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Answer 1

Answer:

900

Step-by-step explanation:

900 = $30^2$

       = $( 6 * 5)^2$

       =$(15*2)^2$

∴ it is divisible by 5, 15, 6

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Answer 2

Option by option analysis:-

A)  Cannot be the answer as 800 is not a perfect square.

B) Cannot be the answer as 625 is a perfect square but not divisible by 6.

C) Cannot be the answer as it is not divisible despite being a perfect square.

D) It is the only option left and is the answer.

Answer:-

Option D

Note:- This is the way to solve in short amount of time and will save much                              time.

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