Question

Interpole 8 meios aritméticos entre 13 e 49.

Answer 1

P.A(13,17,21,25,29,33,37,41,45,49  )
A 1 = 13
A 10 = 49
N = 10
A N = A 1 + (N - 1 )R
A 10 = 13 + (10 - 1 ) .R
49 = 13 + 9 R
49 - 13 = 9 R
36 = 9 R
36/9 = R
R = 4