CTET 2 Math and Science Jan 2012 Paper

Question : 40 of 120

Marks: +1, -0

The least number which is a perfect square and is also divisible by 10, 12, 15 and 18 is

Solution:

L.C.M of 10, 12, 15, 18 is = 180 and 180n is divisible of 10, 12, 15, 18
(∴ n = 1, 2, 3, 4........)
Least no. which is perfect square if

n=5

Required no.

=180×5=900

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