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SSC CGL Model Paper 15

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Question : 3 of 100

Marks: +1, -0

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

\begin{array}{c c c} 3 & 12 & 24 \\ 4 & 5 & 7 \\ 5 & 13 & ? \end{array}

17
18
22
25

Solution:

Concept:

Each column of the given table forms a Pythagorean triplet.

Explanation:

First column:

3,4,5

satisfies

3^2+4^2=5^2

.

Second column:

12,5,13

satisfies

5^2+12^2=13^2

.

Third column:

24,7,?

must be the triplet

7,24,25

.

Check:

7^2+24^2=49+576=625=25^2

.

So, the missing number is

25

.

Answer:

25

(Option D)

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