Find the sum of the first 20 terms of the serie... - JAMB Mathematics 2005 Question
Find the sum of the first 20 terms of the series 8, 12, 16, ....., 96
A
1400
B
1040
C
960
D
920
correct option: b
8, 12, 16, .....96
a = 8, d = 4, l = 96, n = 20
S20 = n/2(a + l)
= 20/2(8 + 96)
= 10 * 104
= 1040
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