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1 solution
2 8 ⋅ 2 9 ⋅ 3 0 ⋅ 3 1 + 1
= ( 2 8 ⋅ 3 1 ) ( 2 9 ⋅ 3 0 ) + 1
= 8 6 8 ⋅ 8 7 0 + 1
= ( 8 6 9 − 1 ) ( 8 6 9 + 1 ) + 1
= 8 6 9 2 − 1 + 1
= 8 6 9