If `(10)^9+2(11)^2(10)^7 +….+10 (11)^9 = k(10)^9`

If (10)^9 + 2(11)^1 (10)^8 + 3(11)^2 (10)^7+...........+10 (11)^9= k (10)^9 , then k is equal to :

Find sum to infinite terms of the series 1 + 2 ((11)/(10)) + 3 ((11)/(10)) ^(2) + 4 ((11)/(10)) ^(3) +………

A number is selected at random from the numbrs 3,5,5,7,7,7, 9,9,9,9. The probability that the selected number is their average is 1/(10) (b) 3/(10) (c) 7/(10) (d) 9/(10)

If Sigma_(r=1)^(10) r(r-1) ""^(10)C_r = k. 2^9

Which of the following is a vulgar fraction? 7/(10) (b) (13)/(1000) (c) 2 9/(10) (d) 7/9

Prove that If (1)/(9!) +(1)/( 10!) =(x)/( 11!) , Find x.

Which one of the following is not equal to ((100)/9)^(-3/2) ? (a)\ (9/(100))^(3/2) (b) 1/(((100)/9)^(3/2)) (c)\ 3/(10)xx3/(10)xx3/(10) (d) sqrt((100)/9\ x(100)/9\ x(100)/9\ )

The value of the integral int(x^2+x)(x^(-8)+2x^(-9))^(1/(10))dx is 5/(11)(x^2+2x)^((11)/(10))+c (b) 5/6(x+1x)^((11)/(10))+c 6/7(x+1)^((11)/(10))+c (d) none of these

If the largest interval to which x belongs so that the greatest therm in (1+x)^(2n) has the greatest coefficient is (10/11, 11/10) then n= (A) 9 (B) 10 (C) 11 (D) none of these

"^10(C_0)^2 - "^10(C_1)^2 + "^10(C_2)^2 - ...... - ( "^10C_9)^2 + ( "^10C_10)^2=