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JEE Main Math Class 11 Sequences and Series Part 2 Questions
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© examsnet.com
Question : 5
Total: 100
The sum
1
+
2
⋅
3
+
3
⋅
3
2
+
.
.
.
.
.
.
.
.
.
+
10.3
9
is equal to
[25-Jun-2022-Shift-2]
2
⋅
3
12
+
10
4
19
⋅
3
10
+
1
4
5
⋅
3
10
−
2
9
⋅
3
10
+
1
2
Validate
Solution:
Let
S
=
1.3
0
+
2.3
1
+
3.3
2
+
.
.
.
.
.
.
+
10.3
9
3
S
=
1.3
1
+
2.3
2
+
.
.
.
.
.
.
.
.
.
+
10.3
10
−
2
S
=
(
1.3
0
+
1.3
1
+
1.3
2
+
.
.
.
.
.
.
+
1.3
9
)
−
10.3
10
⇒
S
=
1
2
[
10.3
10
−
3
10
−
1
−
3
−
1
]
⇒
S
=
19.3
10
+
1
4
© examsnet.com
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