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SSC CGL Model Paper 1

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Question : 8 of 100

Marks: +1, -0

In the following question, select the missing number from the given series.

13,16,11,18,9,20,?

3
5
6
7

Solution:

Concept:

In an alternating series, odd-position and even-position terms follow separate patterns.

Explanation:

Odd-position terms:

13, 11, 9, ?

They decrease by

2

each time.

So,

9 - 2 = 7

.

Even-position terms:

16, 18, 20

increase by

2

.

Thus, the missing number is

7

.

Answer:

7

(Option D)

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