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  2. Multiple choice - Wikipedia

    en.wikipedia.org/wiki/Multiple_choice

    Multiple choice questions lend themselves to the development of objective assessment items, but without author training, questions can be subjective in nature. Because this style of test does not require a teacher to interpret answers, test-takers are graded purely on their selections, creating a lower likelihood of teacher bias in the results. [8]

  3. 6 - Wikipedia

    en.wikipedia.org/wiki/6

    6 is the 2nd superior highly composite number, [5] the 2nd colossally abundant number, [6] the 3rd triangular number, [7] the 4th highly composite number, [8] a pronic number, [9] a congruent number, [10] a harmonic divisor number, [11] and a semiprime. [12] 6 is also the first Granville number, or -perfect number. A Golomb ruler of length 6 is ...

  4. Natural number - Wikipedia

    en.wikipedia.org/wiki/Natural_number

    Sometimes, the whole numbers are the natural numbers plus zero. In other cases, the whole numbers refer to all of the integers , including negative integers. [ 3 ] The counting numbers are another term for the natural numbers, particularly in primary school education, and are ambiguous as well although typically start at 1.