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Number series coding and Decoding and odd man out

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Question : 20 of 51

Marks: +1, -0

Find the oddman out of the series

5,10,17,25

5
10
17
25

Solution:

Concept:

Identify the pattern in the series and find the term that does not follow it.

Explanation:

Observe the numbers:

5, 10, 17, 25

.

5 = 2^2 + 1

10 = 3^2 + 1

17 = 4^2 + 1

25 = 5^2

(not

5^2 + 1

).

All terms except

25

fit the pattern

n^2 + 1

(for

n = 2, 3, 4, 5

).

Therefore,

25

is the odd one out.

Answer:

D. 25

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