8RB Group D 23-Sep-2018 Shift 1 Solved Paper

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Question : 1 of 100

Marks: +1, -0

The LCM of

15 x^{3} y^{4}

and

12 x^{2} y^{5}

is:

$25 x^{3} y^{5}$
$15 x^{3} y^{5}$
$12 x^{3} y^{3}$
$60 x^{3} y^{5}$

Solution:

Factor of

15 x^{3} y^{4}=3 \×5 \×x \×x \× x

\×y \×y \× y \×y

12 x^{2} y^{5}=3 \×2 \×2 \×x \×x

\×y \×y \×y \×y \×y

{LCM}=3 \× 5 \×2 \×2 \×x \× x

\×x \×y \× y \×y \×y \×y

=60 x^{3} y^{5}

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