28 JEE Main 2020 Sequences and Series previous-year questions with verified answers and step-by-step solutions.
These are the JEE Main 2020 previous-year questions from the Sequences and Series chapter of Mathematics. Each links to a full solution with a verified answer key. To see the whole chapter across all years, visit the Sequences and Series chapter hub.
If 2 10 + 2 9 · 3 1 + 2 8 · 3 2 + … … + 2 · 3 9 + 3 10 = S - 2 11 , then S is equal to
Let a n be the n t h term of a G.P. of positive terms. If ∑ n = 1 100 a 2 n + 1 = 200 and ∑ n = 1 100 a 2 n…
Five numbers are in A . P . , whose sum is 25 and product is 2520 . If one of these five numbers is - 1 2 , then the gr…
If the sum of the first 20 terms of the series log 7 1 / 2 x + log 7 1 / 3 x + log 7 1 / 4 x + … is 460 , then x…
The common difference of the A . P .   b 1 ,   b 2 , . . . . , b m is 2 more than common difference of A . P…
If 1 + 1 - 2 2 · 1 + 1 - 4 2 · 3 + 1 - 6 2 · 5 + … … + 1 - 20 2 · 19 = α - 220 …
If the first term of an A . P . is 3 and the sum of its first 25 terms is equal to the sum of its next 15 terms, then t…
If 3 2 sin 2 α - 1 , 14 and 3 4 - 2 sin 2 α are the first three terms of an A.P. for some α , then the s…
The product 2 1 4 ∙ 4 1 16 ∙ 8 1 48 ∙ 16 1 128 ∙ . . . . to ∞ is equal to:
If the 10 t h , term of an A.P. is 1 20 , and its 20 t h , term is 1 10 , then the sum of its first 200 , terms is.
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