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