That's probably an easy one
Algebra
Level
1
Solve:
12321232123212321
12121212121212121
11111111111111111
12345678987654321
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just look at the pattern-
11 x 11 =121
111 x 111=12321
1111 x 1111=1234321.....................................
if it is 11 then at first rising just like that -12 then falling -1
if it is 111 then at first rising three digits-123 then falling -21
so, as there are ( 1 1 1 1 1 1 1 1 1 ) 2 that means 9 times 1
then, it will be --12345678987654321