(25/50)diketahui barisan aritmatika 2,7,12,17,22,27…..tentukan barisan ke 65!​

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(25/50)diketahui barisan aritmatika 2,7,12,17,22,27…..tentukan barisan ke 65!​

Penyelesaian:

a=2

b=7-2=5

Maka

U65=2+(65-1)5

U65=2+(64)5

U65=2+320

U65=322

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SOAL 1

a → 2

b → 5

n → 65

Un = a + (n – 1)b

U65 = 2 + (65 – 1)5

U65 = 2 + (64)5

U65 = 2 + 320

U65 = 322