Answer :
222
121 = ______
1+2+1
(333)2
12321 = __________
1+2+3+2+1
(4444)2
1234321 = ______________
1+2+3+4+3+2+1
(55555)2
123454321 = ___________________
1+2+3+4+5+4+3+2+1
(666666)2
12345654321 = ________________________
1+2+3+4+5+6+5+4+3+2+1
(7777777)2
1234567654321 = _____________________________
1+2+3+4+5+6+7+6+5+4+3+2+1
(88888888)2
123456787654321 = _________________________________
1+2+3+4+5+6+7+8+7+6+5+4+3+2+1
121 = ______
1+2+1
(333)2
12321 = __________
1+2+3+2+1
(4444)2
1234321 = ______________
1+2+3+4+3+2+1
(55555)2
123454321 = ___________________
1+2+3+4+5+4+3+2+1
(666666)2
12345654321 = ________________________
1+2+3+4+5+6+5+4+3+2+1
(7777777)2
1234567654321 = _____________________________
1+2+3+4+5+6+7+6+5+4+3+2+1
(88888888)2
123456787654321 = _________________________________
1+2+3+4+5+6+7+8+7+6+5+4+3+2+1
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