Insert Seven Arithmetic Mean Between 3 And 23?

Insert seven arithmetic mean between 3 and 23?

 

Answer:

3,11/2,8,21/2,13,31/2,18,41/2,23

Step-by-step explanation:

3,_,_,_,_,_,_,_,23

n=9

an=23

a1=3

d=?

an=a1+(n-1)d

23=3+(9-1)d

23=8d+3

8d=20

d=5/2

add to each term:

3,11/2,8,21/2,13,31/2,18,41/2,23

#JuneChallenge


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