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Verified answer
Diketahui :13, 16, 18, 21, ...
a = 13
b = 16 - 13
= 3
ditanya :
jumlah kursi dalam gedung ( s25) ?
jawab :
Sn = n/2 × ( 2a + ( n - 1 ) × b)
S25 = 25/2 × ( 2×13 + 24 × 3 )
S25 = 25/2 × ( 26 + 72 )
S25 = 25/2 × 98
S25 = 2450/2
S25 = 1225
jadi,banyak kuris dalam gedung tersebut adalah 1225 kursi