No digit can be used more that once. The digits corresponding to a given problem can be used

*in any order*. A given symbol can be used more than once and, using less than six distinct symbols is allowed. Concatenating two or more digits is not allowed. Only standard mathematical usage is followed – that is, multiplication does not take precedence over division, addition does not take precedence over multiplication, and so on.

For example, expressions like: 3 + 5*2 - 2^3 or, (123 + 456)/789 are NOT allowed. However, expressions like 3 + 5*8 - 2^4 + 9 are allowed.

(A) 1, 2, 4, 5, 7, 8

(B) 2, 3, 4, 5, 7, 9

(C) 1, 2, 4, 5, 6, 7

(D) 1, 3, 5, 6, 7, 9

(E) 3, 4, 8, 9

(F) 1, 2, 3, 4, 5, 9

(G) 2, 5, 6, 7, 9

(H) 3, 5, 6, 7, 9

(I) 2, 3, 6, 7, 8