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a= 29 x 7 = 203
400/7 = 57,14
un= 57 x7 = 399
barisannya:
203, 210, 217,.... 399
a +(n-1)b = 399
203 + (n-1)7 = 399
7n -7 = 196
7n = 203
n = 29
Sn = 1/2n( a+ un)
S29 = 1/2x 29 ( 203 + 399)
= 14,5 ( 602)
= 8.729...D