If $18, a, (b - 3)$ are in AP, then find the value of $(2 a - b)$ .

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Solution

Given: $18$ , $a, (b - 3)$ are in AP
So, difference between two consecutive terms is same.
$a - 18 = b - 3 - a$
$a + a - b = - 3 + 18$
$2 a - b = 15$

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