Use precisely four 9's, and build an expression that works out to 161.
(I) At least one 9 can be turned upside down to 6.
(II) None of the 9s can be turned around to 6.
(In reply to
a solution by Charlie)
I like it,
Since the puzzle did not define any constraints regarding what operations are admissible, there might be additional solutions
Edited on September 27, 2023, 8:57 am