According to given proportion:
$a : b :: c : d$

a a n d c

are mean terms of the proportion.

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b a n d c

are mean terms of the proportion.

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a a n d d

are the extreme terms of the proportion.

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b a n d d

are the extreme terms of the proportion.

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Solution

The correct options are
B $b a n d c$ are mean terms of the proportion.
C $a a n d d$ are the extreme terms of the proportion.
$a a n d d$ are in the ends of the proportion, hence they are called extreme terms.
$b a n d c$ are in the middle of the proportion, hence they are called mean terms.

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