Question

Q 27. Find the missing term in the series gier
2,5, 21, ?, 1017,10171
Ops: A. 0145
B. 0111
C. 0135
D. 0127
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Answer 1

Answer:

The correct option is D: 127.

Step-by-step explanation:

First number = 2

now 2 X 2 +1 = 5

        5 X 4+1 + 21

        21 X 6 +1 = 127

        127 X 8 + 1 = 1017

        1017 X 10 +1 = 10171

Pattern : Initial number is 2 and initially it is multiplied by 2 and 1 is added to the result. Further, previous result  is multiplied in succession of 2 such as 4,6,8,10....and 1 is added after multiplication.

The missing term would be 127 because when 21 is multiplied by 6 and 1 is added to the resultant number , the final  number would be 127.