Question

if 1,a,b,13are in AP, find a and b
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Answer 1

Answer:

Given: 1,a,b,13 are in A.P.

Here a1=1 a2=a a3=b and a4=13

n(number of terms)=4

Step-by-step explanation:

a4=a+3d

13=1+3d

12=3d

d=4

a2=a+d a3=a+2d

a=1+4 b=1+2(4)

a=5 b=9

Therefore,Value of a=5 and b=9

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