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As shown in the following figure equilateral triangle of size 1 is formed

using 3 match sticks. To form an equilateral triangle of size 3 with all the
equilateral triangle of size 1 inside it we require 18 match sticks. Find the
total number of match sticks required to construct a size 6 equilateral triangle
with all the equilteral triangle of size 1 inside it.


The answer maybe 36 or 54 for the above
1 4 1
The answer given is 63 but I think the answer should be 30...
What do you think?
3/1=3; 18/6=3 ; 18+23=21 so 21*3=63
sorry ** 18+3=21
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