Question

Tolong dijawab nomer 37 sampai nomer 40 pakai cara ya

Answer 1

37)
diket = a = 102 ; b = 3 ; Un = 198

Sn = n/2 (a+Un)
S33 = 33/2 (102 + 198)
S33 = 33/2 . 300
       = 4950

38)
diket = a = 204 ; b = 4 ; Un = 296

S24 = 24/2 ( 204 + 296)
       = 12 . 500
       = 6000

39)
diket = a = 15 ; b = 4 ; n = 12
Sn = n/2 (2a + (n-1)b)
S12 = 12/2 (2.15 + (12-1)4)
       = 6 (30 + 44)
       = 6 (74)
       = 444

40)
diket = a = 1 ; r = 2 ; n = 7
Sn = a(r^n - 1)/(r-1)
S7 = 1(2^7 - 1)/(2-1)
     = (128-1)/1
     = 127