1
Question
Look at this series: 21, 9, 21, 11, 21, 13, . . .
What number should come next?
Look at this series: 21, 9, 21, 11, 21, 13, . . .
What number should come next?
Open in App
Solution
The correct option is B 21
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.
In this Series 21 is common random number.
Now add 2 with 9.
9 + 2 = 11
21 is next common number.
11 + 2 = 13
21 is next common number.
13 + 2 = 15.
21 is next common number.
So the answer is c = 21.
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.
In this Series 21 is common random number.
Now add 2 with 9.
9 + 2 = 11
21 is next common number.
11 + 2 = 13
21 is next common number.
13 + 2 = 15.
21 is next common number.
So the answer is c = 21.
Suggest Corrections
0
Similar questions
View More
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program
