Question

No 9 ... pliezz tlong krjkan

Answer 1

A = 102
b = 2
Un (terakhir) = 298

Un = a + (n-1)b
Un = 102 + (n-1)2
Un = 102 + 2n - 2
Un = 100 + 2n

298 = 100 + 2n
298 - 100 = 2n
198 = 2n
198 : 2 = n
99 = n

Sn = n/2 (a + Un)
S99 = 99/2 (102 + 298)
S99 = 49,5 (400)
S99 = 19.800

MAKA C

Answer 2

A=102 Un=298 b=2

Un=a+(n-1)b
298=102+(n-1)2
298-102=(n-1)2
196=(n-1)2
n-1=196/2
n-1=98
n=98+1=99

Sn=99/2(298+102)=99/2(400)=99(200)=19800