If 18, a, b, -3, are in AP, then a + b is equal to____________
Wrong and irrelevant answers will be reported and correct answer will be marked brainliest
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If 18, a, b, -3, are in AP, then a + b is equal to____________
Wrong and irrelevant answers will be reported and correct answer will be marked brainliest
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Answer:
a + b = 15
Step-by-step explanation:
18, a, b, -3
The given sequence is in A.P.
Therefore, the common difference = (a - 18) .... (1)
Also, common difference = (b - a) = (-3 - b) ..... (2)
Therefore,
(a - 18) = (-3 - b) ..... From (1) & (2)
a + b = 18 - 3
a + b = 15