New chat PYQ Library Doubts Rank report

Sign in to see Recents

Sign in to save progress →

Sequences and Series question

2019 · 12 Jan · Shift 2 · Q30

Guest · try one question or challengeGuest · try one question or challenge

PYQ Library
JEE Main
Mathematics
Sequences and Series
2019 · 12 Jan · Shift 2 · Q30

Sequences and Series question

2019 · 12 Jan · Shift 2 · Q30

JEE MainMathematicsSequences and SeriesMCQ+4 / −1

If nC4, nC5 and nC6 are in A.P., then n can be :

A
11
B
12
C
9
D
14

More from Sequences and Series

If sin4 $α$ + 4 cos4 $β$ + 2 = 4 $2$ sin $α$ cos $β$ ; $α$ , $β \in$ [0, $π$ ], then cos( $α$ + $β$ ) $-$ cos( $α - β$ ) is equal to :2019 · MCQ
If x1, x2, . . ., xn and $\frac{1}{h _{1}}$ , $\frac{1}{h _{2}}$ , . . . , $\frac{1}{h _{n}}$ are two A.P..s such that x3 = h2 = 8 and x8 = h7 = 20, then x5.h10 equals :2018 · MCQ
If b is the first term of an infinite G.P. whose sum is five, then b lies in the interval :2018 · MCQ
If a, b, c are in A.P. and a2, b2, c2 are in G.P. such that a < b < c and a + b + c = $\frac{3}{4},$ then the value of a is :2018 · MCQ
Let $\frac{1}{x _{1}}, \frac{1}{x _{2}}, ..., \frac{1}{x _{n}}$ (xi $e$ 0 for i = 1, 2, ..., n) be in A.P. such that x1=4 and x21 = 20. If n is the least positive integer for which $x_{n} > 50,$ then $i = 1 \sum n (\frac{1}{x _{i}})$ …2018 · MCQ
Let $a_{1}$ , $a_{2}$ , $a_{3}$ , ......... , $a_{49}$ be in A.P. such that $k = 0 \sum 12 a_{4 k + 1} = 416$ and $a_{9} + a_{43} = 66$ . $a_{1}^{2} + a_{2}^{2} + ....... + a_{17}^{2} = 140 m$ , then m is equal to2018 · MCQ
If the arithmetic mean of two numbers a and b, a > b > 0, is five times their geometric mean, then $\frac{a + b}{a - b}$ is equal to :2017 · MCQ
If three positive numbers a, b and c are in A.P. such that abc = 8, then the minimum possible value of b is :2017 · MCQ