Question

Find the arithmetic means for the given sequence:


4, __, __, __, __, 19​

Answer 1

a= 4. b=19. n=4. d= b-a/n+1= (19-4)/(4+1)= 15/5=3. Hence, d=3.

Explanation:

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Answer 2

7 10 13 16

Explanation:

a1 = 4

a6 = 19

n = 6

d = ?

a6 = a1 + (n - 1)d

19 = 4 + (6 - 1)*d

19 - 4 = 5*d

15 = 5d

d = 15/5

d = 3

So the sequence is

4,7,10,13,16,19