'Twas the Night Before Thanksgiving

'Twas the Night Before Thanksgiving

Matematika 1+3+5+7+9+ ... +47+49+50=​

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

Jumlah summasi : 675.

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