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WAEC Mathematics 2021 Paper

Question : 5

Total: 49

Find the 5th term of the sequence 2,5,10,17....?

Solution:

Concept:

The sequence increases by consecutive odd numbers:

3,5,7,9,\ldots

Explanation:

Write the given sequence as

2,5,10,17,\ldots

Add

3

2

to get

5

Add

5

5

to get

10

Add

7

10

to get

17

So the next odd number to add is

9

17 + 9 = 26

Therefore, the 5th term is

26

Answer:

26

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