# Question #99b2b

##### 1 Answer

The question only asks for the missing number which is 34

#### Explanation:

When faced with a sequence you first need to establish if is arithmetic or geometric.

By example

Arithmetic:

Progresses by some variant on addition or subtraction of a constant

Geometric:

Progresses by some variant on the multiplication or division of some constant raised to a power.

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Observe that:

This indicates that it is a arithmetic progression and that as it is reducing the change is

Check:

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Let the first term be

Let the

By observation we deduce that:

check: