for arithmetic progression T18-T8=
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Answer:
t18= a+(n-1) d
t18=a+(18-1)d
t18=a+17d
t8=a+(n-1) d
t8=a+(8-1)d
t8=a+7d
t18-18=a+17d - a-7d
t18-t8=10d
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