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Mathematics
Problem
Which of the following triplets of numbers are in arithmetic progression? a)
3
,
6
,
12
3,\,6,\,12
3
,
6
,
12
b)
4
,
8
,
12
4,\,8,\,12
4
,
8
,
12
c)
7
,
11
,
14
7,\,11,\,14
7
,
11
,
14
d)
4
,
7
,
11
4,\,7,\,11
4
,
7
,
11
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