Number Series

Choose the next number under the intended pattern.

series-v2-007Hard

1 · 10 · 4 · 20 · 9 · 30 · 16 · 40 · ?

A20B25C36D50

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Read the odd positions separately from the even positions.

Enable JavaScript to check your answer. Hint: Read the odd positions separately from the even positions.

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Odd positions are 1, 4, 9, 16: squares. Even positions are 10, 20, 30, 40. The next odd-position term is 25.

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