Q3 of 178 Page 548

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

Since, the terms are in an AP, therefore

a - 18 = (b - 3) - a


⇒ 2a - b = - 3 + 18


⇒ 2a - b = 15


∴ 2a - b = 15


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