There are allot of different signs such as+<
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9+8+7+65+4+3+2+1 = 99. So 7 addition signs need to go in 987654321 to get a total of 99.
addition.
"What is 3*(-5)" would be such a problem.
io dont know
9 + 8 + 7 + 65 + 4 + 3 + 2 + 1 = 99, so 7 plus signs.