MCQ
If $a, b$ and $c$ are in $A.P$. then the relation between them is given by :
- A$2c = a + b$
- B$2a = b + c$
- C$a = b + c$
- ✓$2b = a + c$
✓
Answer
Correct option: D.
$2b = a + c$
We know that if $a, b, c, ...$ are in $AP$ then $2^{nd}$ term $- 1^{st}$ term $= 3^{rd}$ term $- 2^{nd}$ term
$b - a = c - b$
$\Rightarrow 2b = a + c$
$b - a = c - b$
$\Rightarrow 2b = a + c$
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