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Four Numbers in AP
## Formula
Four numbers in AP can be represented as:
$$a-3d,\ a-d,\ a+d,\ a+3d$$
Their sum is:
$$4a$$
## Usage
- Used to simplify problems involving four numbers in AP by choosing a symmetric representation.
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Four Numbers in AP
## Formula
Four numbers in AP can be represented as:
$$a-3d,\ a-d,\ a+d,\ a+3d$$
Their sum is:
$$4a$$
## Usage
- Used to simplify problems involving four numbers in AP by choosing a symmetric representation.
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