1
JEE Main 2021 (Online) 25th July Morning Shift
+4
-1
Let Sn be the sum of the first n terms of an arithmetic progression. If S3n = 3S2n, then the value of $${{{S_{4n}}} \over {{S_{2n}}}}$$ is :
A
6
B
4
C
2
D
8
2
JEE Main 2021 (Online) 22th July Evening Shift
+4
-1
Let Sn denote the sum of first n-terms of an arithmetic progression. If S10 = 530, S5 = 140, then S20 $$-$$ S6 is equal to:
A
1862
B
1842
C
1852
D
1872
3
JEE Main 2021 (Online) 20th July Evening Shift
+4
-1
Out of Syllabus
If sum of the first 21 terms of the series $${\log _{{9^{1/2}}}}x + {\log _{{9^{1/3}}}}x + {\log _{{9^{1/4}}}}x + .......$$, where x > 0 is 504, then x is equal to
A
243
B
9
C
7
D
81
4
JEE Main 2021 (Online) 18th March Evening Shift
+4
-1
Let S1 be the sum of first 2n terms of an arithmetic progression. Let S2 be the sum of first 4n terms of the same arithmetic progression. If (S2 $$-$$ S1) is 1000, then the sum of the first 6n terms of the arithmetic progression is equal to :
A
7000
B
1000
C
3000
D
5000
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