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Scorpion4ik [409]
3 years ago
13

Find the 100th term in the arithmetic sequence

Mathematics
1 answer:
fiasKO [112]3 years ago
5 0

a_n=a_1+(n-1)d\\\\d=a_{n+1}-a_n


a_1=-19;\ a_2=-14;\ a_3=-9;\ a_4=-4;\ a_5=1;\ ...\\\\d=a_2-a_1=a_3-a_2=a_4-a_3=...\\\\d=-14-(-19)=-14+19=5\\\\a_n=-19+(n-1)(5)=-19+5n-5=5n-24\\\\a_{100}=5(100)-24=500-24=476\to\boxed{c.}

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