show that the sequence defined by an=4n+5 find sum of 6 terms
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Sn = (n/2)*(a + an)
Given
an = 4n + 5
a = 9
a6 = 29
S6 = (6/2)*(9 + 29)
S6 = 3*38
S6 = 114 ——> Answer
Given
an = 4n + 5
a = 9
a6 = 29
S6 = (6/2)*(9 + 29)
S6 = 3*38
S6 = 114 ——> Answer
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