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Which One Doesn’t Belong?

upper left: white rectangle, about twice as wide as tall, in standard orientation<br /> upper right: shaded square in standard orientation<br /> lower left: white square, balanced on its corner<br /> lower right: white, regular pentagon in standard orientation

shapes

numbers

graphs

Four expressions in a two-by-two grid<br /> upper left: y equals x-squared.<br /> upper right: y equals b to the x power.<br /> lower left: y equals x.<br /> lower right: y equals square root of x.<br />

expressions

Four objects in a two-by-two grid<br /> upper left: a chocolate frosted, plain donut.<br /> upper right: a blue and white speckled metal coffee cup.<br /> lower left: a square everything bagel.<br /> lower right: the top of a hamburger bun, with sesame seeds sprinkled on top.

photos

A two-by-two grid of numbers, with one number missing<br /> upper left: Instead of a number, there is a question mark.<br /> upper right: 125.<br /> lower left: 216.<br /> lower right: 8.

incomplete sets

A two-by-two grid of patterns, three stages in each pattern; all patterns made of small square tiles.<br /> upper left: Upside down T’s. 1: Horizontal row of three squares with one on top. 2: Horizontal row of five squares with two on top. 3: Horizontal row of seven squares with three on top.<br /> upper right: 1: An X with each of four arms being a single tile. 2: An X with each arm two tiles. 3: An X with each arm three tiles.<br /> lower left: 1: four single tiles arranged like a plus sign with a missing center. 2: The plus sign now has grown to two tiles in each direction. 3: The plus sign has four tiles in each direction.<br /> lower right: 1: A plus sign with three tiles in each direction, and a missing center. 2: A plus sign with two tiles in each direction. 3: The plus sign has only a single tile in each direction.

miscellaneous