What is the smallest number of ducks that could swim in this formation - two duc

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What is the smallest number of ducks that could swim in this formation - two ducks in front of a duck, two ducks behind a duck and a duck between two ducks ?

Options:

A . 3

B . 5

C . 7

D . 9

Answer: Option A
Clearly, the smallest such number is 3.
Three ducks can be arranged as shown above to satisfy all the three given conditions.

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