Matematika Tolong kak dijawab yg bener​

braintillmanulv – April 01, 2023

Tolong kak dijawab yg bener​

Jawaban:

U1 = 21

U2 = 23

Un = 79

b = U2-U1

= 23-21

= 2

Un = U1 + (n-1)b

79 = 21 + (n-1)(2)

2(n-1) = 79-21

n-1 = 58÷2

n = 29+1

= 30

Sn = n/2 × (U1+Un)

= 30/2 × (21+79)

= 1500

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