2005
Mathematics
67ca00ce0c643c71d77dee1f
Find the sum of the first 20 terms of the series 8, 12, 16, ....., 96
A.
1400
B.
1040
C.
960
D.
920
Correct Answer: 1040
Explanation
8, 12, 16, .....96 a = 8, d = 4, l = 96, n = 20 S20 = n/2(a + l) = 20/2(8 + 96) = 10 * 104 = 1040
8, 12, 16, .....96 a = 8, d = 4, l = 96, n = 20 S20 = n/2(a + l) = 20/2(8 + 96) = 10 * 104 = 1040THIS WEEK's
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