# If 18, a, b, -3 are in the arithmetic progression then a + b =A. 19B. 7C. 11D. 15

Since they are in arithmetic progression their common difference is same.
a – 18 = b – a = -3 – b
a – 18 = -3 – b
a + b = 18 – 3
a + b = 15.

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