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a=201
b=3.
399 (suku terakhir barisan)=201+(n-1)3.
399=3n+198 3n=201 n=67.
krn merupakan barisan aritmatika, maka pk rumus
Sn=n/2{2a+(n-1)b.
=67/2{402+66(3)}
=67/2(600)
=20.100
a = 201
b = 3
un = 399
un= a + (n - 1) b
399 = 201 + (n - 1) 3
399 - 201 = 3n - 3
198 + 3 = 3n
201 = 3n
67 = n
Sn = n/2 (a+un)
Sn = 67/2 (201 + 399)
Sn = 67/2 (600)
Sn = 20.100