The given series is a decreasing series.

The pattern of the series is as follows:

640 - 280 = 360
360 - 200 = 160
160 - 120 = 40
40 - 40 = 0

So, the difference between the terms is decreasing by 80 each time.

Following this pattern, the next difference should be 80 less than 40, which is -40.

So, the missing term in the series is:

0 - (-40) = 0 + 40 = 40

Therefore, the missing term is 40.

Question

The given series is a decreasing series.

The pattern of the series is as follows:

640 - 280 = 360
360 - 200 = 160
160 - 120 = 40
40 - 40 = 0

So, the difference between the terms is decreasing by 80 each time.

Following this pattern, the next difference should be 80 less than 40, which is -40.

So, the missing term in the series is:

0 - (-40) = 0 + 40 = 40

Therefore, the missing term is 40.

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