an=a1+(n-1)r
a1=7
a5=23
a5=a1+4r
23=7+4r
-4=7-23
-4r=-16/:(-4)
r=4
a=7+4=11
b=11+4=15
c=15+4=19
a₅=a₁+4r
4r=23-7
4r=16
r=16;4
................
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an=a1+(n-1)r
a1=7
a5=23
a5=a1+4r
23=7+4r
-4=7-23
-4r=-16/:(-4)
r=4
a=7+4=11
b=11+4=15
c=15+4=19
a₅=a₁+4r
23=7+4r
4r=23-7
4r=16
r=16;4
r=4
................
a=7+4=11
b=11+4=15
c=15+4=19