Question

interpolar 20 meios aritméticos entre 7 e 91

Answer 1

P.A(7, 11,15,19,23,27,31,35,39,43,47,51,55,59,63,67,71,75,79,83,87,91 )
N = 22
A 22 = 91
A 1 = 7
A 22 = A1 + (N - 1).R
A 22 = 7 + (22 - 1 ).R
A 22 = 7 + 21.R
91 - 7 = 21.R
84 = 21 R
84/21 = R
R = 4