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Mathematics
Problem
In an arithmetic progression, the 6th term is 20 while the sum of the first 6 terms is 75. Which of the following ordered pairs (a, d) represents the first term and the common difference of the progression? a)
(
8
,
1
)
(8, 1)
(
8
,
1
)
b)
(
5
,
3
)
(5, 3)
(
5
,
3
)
c)
(
4
,
4
)
(4, 4)
(
4
,
4
)
d)
(
6
,
2
)
(6, 2)
(
6
,
2
)
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