Week 1 – My Arthmetic Sequence

Arithmetic sequence – 3, 7, 11, 15, 19……

Formula – tn= t1+(n-1)d

t50=?

d=4

n=50

tn= t1+(n-1)d

t50=3+(50-1)4

t50=3+(49 x 4)     (49×4=196)

t50=3+196

t50=199

 

Sum of 50

 

Formula – Sn = n/2 (t1 + tn)

 

S50 = 50/2 (t1 + t50)

S50 = 25 (3 + 199)

S50 = 25 x 202

S50 = 5050

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