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a15=a1+(15-1)r
a15=2+14*5
a15=72
a₂= 7 bo 7/5 daje reszte 2
r= 12-7 = 5
a₁= 7-5= 2
Czyli a₁₅= a₁+(n-1)r
a₁₅=2+(15-1)5
a₁₅=2+70
a₁₅=72
a2=7
a1=2
a15=a1+(15-1)r
a15=2+14*5
a15=72