Mensa is an association for people with high IQs. An advertisement for the organization offers the following challenge:
“Take this instant test to see if you’re a genius.”

The advertisement also states, “This problem stumps 45% of the Mensa members who try it. And they all have IQs in the top 2% nationwide. See if you can pass this test. If you can do it, you might have what it takes to join us. To find out, write to American Mensa, 2626 East 14th St., Brooklyn, NY 11235.”

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Put the appropriate plus or minus signs between the numbers, in the correct places, so that the sum total will equal 1. 0 1 2 3 4 5 6 7 8 9 = 1