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200 = 5 + 5(n-1)
195= 5n - 5
200 = 5n
n = 40
U39 = 195
400 = 5+5(n - 1)
400 = 5n
n = 80
Ada 41 bilangan -> interval [200,400]
Ada 39 bilangan -> interval (200,400)
a = b
Interval [200,400]
S80 - S39
= 40(2a + 79b) - 19.5(2a + 38b)
= 80a + 3160b - 39a + 741b
= 41a + 2419b
= 2450a
= 12250
bila (200, 400)
S79 - S40
= (S80 - S39) - U80 - U40
= 12250 - 400 - 200
= 11650
Semoga membantu :)