Question

Interpol e 9 meios aritméticos entre 9 e 79

Answer 1

Encontrara a razão da PA

an = a1 + ( n -1) . r
79 = 9 + ( 11 -1) . r
79 = 9 + 10r
70 = 10r  
r = 7 

===

an = a1 + ( n -1) . r  =  an
an = 9 + ( 1 -1) .7  =  9
an = 9 + ( 2 -1) .7  =  16
an = 9 + ( 3 -1) .7  =  23
an = 9 + ( 4 -1) .7  =  30
an = 9 + ( 5 -1) .7  =  37
an = 9 + ( 6 -1) .7  =  44
an = 9 + ( 7 -1) .7  =  51
an = 9 + ( 8 -1) .7  =  58
an = 9 + ( 9 -1) .7  =  65
an = 9 + ( 10 -1) .7 =  72
an = 9 + ( 11 -1) .7  =  79



PA = ( 9, 16, 23, 30, 37, 44, 51, 58, 65, 72, 79 )