Question

(LCD)
of 25/42 and 11/18
no answer just explainnn..

i factored (dnt know if thts a real word)
42
2x21
2x7
so 42 is 2x3x7
THEN
18
2x9
3x3
18 is 2x3x3

then they said.

Find the LCM of 42 and 18.

"Since we count the duplicate pairs of factors (circled below) only once, the LCM of 42 and 18 is 2×3×3×7, or 126.

So, the LCD of the fractions is 126."

why did they double the "3"
and not the "2"?
what made it 2x3x3x7



i need clarity for everything
story of my life...

Answer 1

42=2*3*7
18=2*3*3
now u see 2*3 is common in both so it will be taken only once as it is common in both
and 3 and 7 are remained there
so lcm=2*3*3*7

Answer 2

@Anjxo ..gotta????

Answer 3

yes thank you so much @gorv !x)