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Mathematics
Mathematics
Problem
The sum of the first 5 terms of an arithmetic progression is 25 and the sum of the first 10 terms is 100. Which of the following ordered pairs
(
a
,
d
)
(a,\,d)
(
a
,
d
)
represents its first term and common difference? a)
(
0
,
2
)
(0,\,2)
(
0
,
2
)
b)
(
1
,
2
)
(1,\,2)
(
1
,
2
)
c)
(
3
,
1
)
(3,\,1)
(
3
,
1
)
d)
(
−
1
,
3
)
(-1,\,3)
(
−
1
,
3
)
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