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    Study the given pattern carefully and select the number that can replace the question mark (?) in it.​
    Question

    Study the given pattern carefully and select the number that can replace the question mark (?) in it.

    A.

    21

    B.

    10

    C.

    9

    D.

    5

    Correct option is C

    Given
    Logic: {Product of two upper number - 2 } ÷2 = Lower number 
    {(2 × 3) - 2}÷2  = 4 ÷ 2 = 2 
    {(3 × 4) - 2}÷2 = 10 ÷ 2 = 5
    Similarly;
    {(4 × 5) - 2}÷2 = 20 - 2 = 18 ÷ 2 =
    {(5 × 8) - 2}÷2 = 40 - 2 = 38 ÷ 2 = 19 
    Thus, correct option is (c).




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