Test Index

SSC CGL Model Paper 20

Question : 9 of 100

Marks: +1, -0

100,-20,4,? 0.16,-0.032

Solution:

Concept:

This is a geometric series where each term is obtained by multiplying the previous term by a constant ratio.

Explanation:

Find the common ratio:

r = \frac{-20}{100} = -\frac{1}{5}

Check the next term:

-20 \times \left(-\frac{1}{5}\right) = 4

So the missing term is:

4 \times \left(-\frac{1}{5}\right) = -0.8

Verify further:

-0.8 \times \left(-\frac{1}{5}\right) = 0.16

, and

0.16 \times \left(-\frac{1}{5}\right) = -0.032

Answer:

The missing number is

-0.8

, so option D is correct.

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