Question

Look at the pattern below:
1
1+2+1
1+2+3+2+1
. 1+2+3+4+3+2+1
1+2+3+4+5+4+3+2+1
Find the sum of the 12th row.
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Answer 1

Answer:

1+2+3+4+5+6+5+4+3+2+1