116 + 123 + 130 + ... s25 : ... tolong dijawab ya .. pleaseeeeeeee

Sn = n/2 (2a + (n - 1)b)
S25 = 25/2 (2 x 116 + (25 - 1)7)
S25 = 12,5 (232 + 24 x 7)
S25 = 12,5 (232 + 168)
S25 = 12,5 x 400
S25 = 5000

116,123,130
a=116
b=123-116=7

[tex] S_n =\frac{n}{2} (2a +(n-1)b) [/tex]
[tex] S_{25}=\frac{25}{2} (2(116) + (25-1)7)) [/tex]
[tex] S_{25}=\frac{25}{2} (232 + 168) [/tex]
[tex] S_{25}=\frac{25}{2} [/tex] x 400
[tex] S_{25} [/tex]= 25 x 200
=5000

Tandai sebagai terbaik ya dek