Subject

    মানসিক দক্ষতা

    Topic

    সংখ্যাগত ক্ষমতা

    Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should come next?

    ক)
    14
    খ)
    15
    গ)
    21
    ঘ)
    23

    Explanation

    In this alternating repetition series, the random number 21 is interpolated every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.

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