If 18,a, b,-3 are in AP, then a+b is equal to
2 answers:
Answer:
a + b = 15
Step-by-step explanation:
The common difference d between consecutive terms is
d = a₂ - a₁ = a - 18
d = a₄ - a₃ = - 3 - b
Thus
a - 18 = - 3 - b ( add b to both sides )
a + b - 18 = - 3 ( add 18 to both sides )
a + b = 15
In AP?
But in normal arithmetic
18+[-3]=15
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