MathDB

Harry, who is incredibly intellectual, needs to eat carrots

C_1, C_2, C_3

and solve Daily Challenge problems

D_1, D_2, D_3

. However, he insists that carrot

C_i

must be eaten only after solving Daily Challenge problem

D_i

. In how many satisfactory orders can he complete all six actions?
Proposed by Albert Wang (awang2004)

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