Question

the least number of 4 digits which is a perfect square and divisible by 9, 15, 18​

Answer 1

Answer:

LCM OF 9,15,18

9-> 3×3

15-> 3×1×5

18->3×3×1×2

lcm =3×3×5×2

lcm=90

perfect3digit square no = 90×5×2 because 5×2

is not exist in pair

perfect square no.=90×10

perfect square no.=900

then 4 digit least no which is divisible by 9,15,18

=900×2×2

=3600

highest

= 900×3×3

=8100