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Mathematics
Problem
Which of the following sets of three numbers is an arithmetic progression? a)
1
,
3
,
6
1,\,3,\,6
1
,
3
,
6
b)
2
,
4
,
8
2,\,4,\,8
2
,
4
,
8
c)
4
,
7
,
10
4,\,7,\,10
4
,
7
,
10
d)
2
,
5
,
9
2,\,5,\,9
2
,
5
,
9
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