If a, b, c are in AP and a + b + c = 5, Find the value of 3b

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Solution

The correct option is D
5

a, b, c are in AP

$\Rightarrow$ $\frac{(a + c)}{2}$ = b

$\Rightarrow$ a + c = 2b

a + b + c =5 (given)

b + (a + c) = 5

b + 2b = 5

3b = 5

b = $\frac{5}{3}$

$\Rightarrow$ 3b = 5

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