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Three Numbers in AP and GP
## Formula
If three numbers $$a,b,c$$ are in AP:
$$2b=a+c$$
If they are in GP:
$$b^2=ac$$
If they are in HP:
$$\frac2b=\frac1a+\frac1c$$
## Usage
- Used to quickly identify or construct three-term AP, GP and HP sequences.
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Three Numbers in AP and GP
## Formula
If three numbers $$a,b,c$$ are in AP:
$$2b=a+c$$
If they are in GP:
$$b^2=ac$$
If they are in HP:
$$\frac2b=\frac1a+\frac1c$$
## Usage
- Used to quickly identify or construct three-term AP, GP and HP sequences.
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