18, a, b, -3
a+b =
care A.P then
Answers
Answered by
1
Answer:
answer is 15
Step-by-step explanation:
d= a-18
d =-3-b
now,
a-18 = -3-b
transpose -18 and - b
a+b =+18 -3 so
a+ b = 15
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