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sequences

Arithmetic sequences

February 3, 2018February 13, 2018 dashao2015 Leave a comment

5,10,15,20,25

common d= 5

t_{50}= 5+{(50-1)}{(5)}

t_{50}= 5+{(49)}{(5)}
t_{50}=5+245
t_{50}=249

tn= 5+(n-1) 5 t_{n}= 5+{(49n)}{-5} t_{n}= -245n-5

S_{50}=\frac{50}{2}{(5+250)}
S_{50}={25}{(255)}
S_{50}={6375}

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