Question

if 18,a,b‐3are in A.P tehn a+b=​

Answer 1

Step-by-step explanation:

11th

Maths

Sequences and Series

Arithmetic Mean of AP

If 18, a, b, - 3 are in AP ...

MATHS

If 18,a,b,−3 are in AP then find a+b.

EASY

Share

Study later

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

Answered By : Tahashin Taj

mark as brainliest