Question

Find the missing number in the following series 20, 25, 28, ?, 44, 43
Select one:
a. 32
O b. 23
oc. 12
d. 31

Answer 1

Answer

missing number is 32

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Answer 2

The missing number in the following series 20, 25, 28, ?, 44, and 43 is, (option d)

• Observe the number at the odd place.

         $28-20=8\\44-28=16$

• Observe the number at the even place. Use the values given in the option one by one.

        $32-25=7\\43-32=11$

        Here, the difference between the number 25 and chosen value 32  is 7 and the difference between 32 and 43 is 11.

       $23-25=-2\\43-23=20$

        Here, the difference between the number 25 and chosen value 23  is -2 and the difference between 23 and 43 is 20.

       $12-25=-13\\43-12=31$

      Here, the difference between the number 25 and chosen value 12  is -13 and the difference between 12 and 43 is 31.

       $31-25=6\\43-31=12$

• 31 fits the best as it matches with the pattern that is followed for the terms at the odd place.
• So, 31 will come after 28 in the given series.