019) If 18,a,b,-3 are in AP,then
a+b is equal to
Answers
Answered by
0
Answer:
Let p, be the first term i.e; 18
And, d, be the common difference,
From given series,
4th term =p+3d=−3
⟹18+3d=−3
Hence, d=−7
So, a=p+d=18−7=11
And, b=p+2d=18−14=4
Therefore,
a+b=11+4=15
Similar questions