Math Drops from Five Answer Choices to Four

Every math question used to carry five choices. Now it carries four. That one missing wrong answer changes the arithmetic of guessing. With five choices, a blind guess lands right 1 in 5 times, or 20 percent. With four choices, it lands right 1 in 4 times, or 25 percent. Nothing about the math itself got simpler — the only thing that changed is how many wrong paths you have to wade through before hitting the right one.

Think about what a blind guess really is: picking one option out of a set where every option looks equally plausible to someone who knows nothing. Shrink the set from five to four and each surviving option picks up a bigger share of the probability. Over many questions, this nudges the expected number of correct guesses upward by exactly one twentieth of the questions you guess on — one quarter minus one fifth. On 8 guessed questions, that is 8 times one quarter, or 2 expected correct, versus 1.6 expected correct under the old five-choice format.

The real effect isn't about blind guessing at all — it's about strategy. With only three wrong answers to eliminate instead of four, backsolving (plugging answer choices into the problem to see what fits) becomes faster and more reliable. Test-makers found that four-choice items got answered correctly more often, not because the problems got easier, but because students could kill wrong choices faster and narrow in on the right one. This connects directly to timing: fewer choices per question means elimination strategies pay off faster, which matters on a section where the clock never stops.