Question

complete the 6, 4, 9, 15.5 number series​

Answer 1

Number series​ :

                            6                 4                 9                 15.5                 ?

difference:                   2                  5                 6.5                7.25 (6.5 + 0.75)

Double difference:                 3                  1.5                       0.75

so,

in the place of ? we put the value of 15.5 + 7.25

so,                                    ? = 15.5 + 7.25

                                        ? = 22.75

we see that this series is in double difference.

so we calculate the value of ?.

so ,

                                 22.75 is the missing number

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