Question

Look at the pattern and fill in the blanks
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
1+2+3+4+5+6+5+4+3+2+1
1+2+3+4+5+6+7+6+5+4+3+2+1

​

Answer 1

Answer:

1

1221

12321

1234321

123454321

12345654321

1234567654321