Question

Hitunglah jmlh deret aritmetika
U1=3 b=2 suku terakhir=41
Tolong ya...dikumpul hari ini

Answer 1

Sn  = 1/2n [2a + (n-1) b]
S41= 1/2.41 [2.3 + (41-1) 2)
      = 20,5 [6+80)
      = 20,5 x 86
      = 1.763  

Answer 2

Sn=n/2 [2a+(n-1)b]
S41=41/2 [2.3+(41-1)2]
S41=41/2[6+40.2]
S41=41/2[6+80]
S41=41/2[86]
S41=41.43
S41=1763

maaf jika jawabanya keliruyah