Объяснение:
a
1
=6
�
2
=
12
=12
246
n
=246
−
6
d=a
−a
=12−6=6
+
∗
S
+a
∗n
(
)
=a
+(n−1)∗d
246=6+(n−1)∗6
240
(n−1)∗6=240
40
n−1=40
41
n=41
252
126
5166
6+246
∗41=
∗41=126∗41=5166
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Answers & Comments
Объяснение:
a
1
=6
�
2
=
12
a
2
=12
�
�
=
246
a
n
=246
�
=
�
2
−
�
1
=
12
−
6
=
6
d=a
2
−a
1
=12−6=6
�
�
=
�
1
+
�
�
2
∗
�
S
n
=
2
a
1
+a
n
∗n
�
�
=
�
1
+
(
�
−
1
)
∗
�
a
n
=a
1
+(n−1)∗d
246
=
6
+
(
�
−
1
)
∗
6
246=6+(n−1)∗6
(
�
−
1
)
∗
6
=
240
(n−1)∗6=240
�
−
1
=
40
n−1=40
�
=
41
n=41
�
41
=
6
+
246
2
∗
41
=
252
2
∗
41
=
126
∗
41
=
5166
S
41
=
2
6+246
∗41=
2
252
∗41=126∗41=5166