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Mathematics
The sum of the common terms of the following three arithmetic progressions. 3,7,11,15, ldots ., 399, 2,5,8,11, ldots ., 359 and 2,7,12,17, ldots ., 197, is equal to
Q. The sum of the common terms of the following three arithmetic progressions.
3
,
7
,
11
,
15
,
…
.
,
399
,
2
,
5
,
8
,
11
,
…
.
,
359
and
2
,
7
,
12
,
17
,
…
.
,
197
,
is equal to _____
3318
131
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Sequences and Series
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Answer:
321
Solution:
3
,
7
,
11
,
15
,
…………
,
399
d
1
=
4
2
,
5
,
8
,
11
,
…………
.
,
359
d
2
=
3
2
,
7
,
12
,
17
,
……
,
197
d
3
=
5
LCM
(
d
1
,
d
2
,
d
3
)
=
60
Common terms are 47, 107,
167
Sum
=
321