Home
Class 10
MATHS
If an=(n(n+1))/2 a4=….....

If `a_n=(n(n+1))/2 a_4`=…..

A

10

B

8

C

15

D

6

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • PROGRESSIONS

    BEYOND PUBLICATION|Exercise EXERCISE|259 Videos
  • PROBABILITY

    BEYOND PUBLICATION|Exercise EXERCISE|136 Videos
  • QUADRATIC EQUATIONS

    BEYOND PUBLICATION|Exercise EXAMPLE|135 Videos

Similar Questions

Explore conceptually related problems

In a series a_n= (n(n+1))/2, a_2 = .......

a_n=(n-1)(n-2) then a_5 =….

a_n= 1/(n+2), a_3 = ...........

Find the indicated terms in each of the sequences whose n^("th") terms are: a_n=(n(n-2))/(n+3),a_(20)

a_n = 2^n, a_5 = ........

If a_0, a_1 , a_2 …..a_n are binomial coefficients then (1 + a_1/a_0)(1 +a_2/a_1) …………….(1 + (a_n)/(a_(n-1)) ) =

1+(n)/(2)+(n(n-1))/(2.4)+(n(n-1) (n-2))/(2.4.6)+…....=

If n is a non zero rational number then show that 1 + n/2 + (n (n - 1))/(2.4) + (n(n-1)(n - 2))/(2.4.6) + ….. = 1 + n/3 + (n (n + 1))/(3.6) + (n (n + 1) (n + 2))/(3.6.9) + ….

If a_0 = x, a_( n+1) = f(a_n) , " where" n = 0,1,2……… then answer the following questions If f(x) = (1)/( 1-x) then which of the following is not true?