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(4+2)x3+1=19
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171 = 3^2*19.
2^1 x 3^1 x 19^1
If combining digits to form 2-digit numbers is allowed then some solutions are :- 21 + 3 - 5 = 19 23 + 1 - 5 = 19
only using the numbers once
1 x 2 sqrt(4) = 4