Penjelasan dengan langkah-langkah:
a = 3
b = 3
→ Un = 3n ( karena selisih antar suku selalu 3 )
Un = 33
n = 33
3
n = 11
a) Ut = a + Un
2
Ut = 3 + 33
Ut = 36
b) Sn = ½n(a + Un)
Sn = ½n( 3 + 3n)
S11 = 3×11×(1 + 11)
S11 = 33 × 12
S11 = 33 × 6
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Penjelasan dengan langkah-langkah:
a = 3
b = 3
→ Un = 3n ( karena selisih antar suku selalu 3 )
Un = 33
n = 33
3
n = 11
a) Ut = a + Un
2
Ut = 3 + 33
2
Ut = 36
2
Ut = 18
b) Sn = ½n(a + Un)
Sn = ½n( 3 + 3n)
Sn = 3n(1 + n)
2
S11 = 3×11×(1 + 11)
2
S11 = 33 × 12
2
S11 = 33 × 6
S11 = 198