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a)różnicę w ciągu arytmetycznym
a4-a1=3r
14-8=3r
6=3r
r=2
b)a25=a1+24r
a25=8+24*2
a25=8+48
a25=56
c)s15=(2a1+14r)/2*14
s15=(2*8+14*2)/2*14
s15=(16+28)*7
s15=44*7
s15=308