
I assume that x = figure no.
It's better to write this as
Tiles = 10n-18
Thus 10(12) - 18
=120 - 18
= 102
THUS HE IS WRONG.
Equation of pattern;
y = 10x - 18
If number of figure x = 12 then 108 tiles is true or false
y = 10x - 18
If x = 12
y = (10)(12) - 18
So,
If number of figure x = 12 then 108 tiles is False
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