Question

Determine a razão de cada P.A
a) (-16,-5,6,17)
b) (3/4,1,5/4,3/2)
c) b,2b,3b,4b)

Answer 1

r = ?
a)P.A.(-16 , -5 , 6 , 17 )
r = a 2 - a 1
r = -5 - (-16)
r = -5 + 16
r = 11

b)P.A.(3/4 ; 1 ; 5/4 ; ; 3/2 )
r = a 2 - a 1
r = 1 - 3/4
r = 4/4 - 3/4
r = 1/4

c)P.A.(b ; 2 b ; 3 b ; 4 b )
r = a 2 - a 1
r = 2 b - b
r = b