1+3+5+7+9+ ... +47+49+50=
Jawaban:
DerArit =
Un = a + (n-1)b
49 = 1 + (n-1)2
49 = 1 + 2n - 2
49 = 2n - 1
n = 25
maka :
Sn = n² + 50
Sn = 25² + 50
Sn = 675
'Twas the Night Before Thanksgiving
'Twas the Night Before Thanksgiving
Jawaban:
DerArit =
Un = a + (n-1)b
49 = 1 + (n-1)2
49 = 1 + 2n - 2
49 = 2n - 1
n = 25
maka :
Sn = n² + 50
Sn = 25² + 50
Sn = 675