[" 1.Which of the drawings (a) to (d) abner "],[[" (i) "2times(1)/(5)," (n) "2<(1)/(2)],[" (a) "(1)," (i) "]]

Which of the drawings (a) to (d) show : (i) 2xx(1)/(5) (ii) 2xx(1)/(2) (iii) 3xx(2)/(3)( iv 3xx(1)/(4)

Which of the drawings (a) to (d) show : (i) 2 xx 1/5 (ii) 2 xx 1/2 (iii) 3 xx 2/3 (iv) 3 xx 1/4

If sum_(i=1)^n(x_i+1)^2=9n and sum_(i=1)^n(x_i-1)^2=5n , then standard deviation of these 'n' observations (x_1) is: (1) 2sqrt(3) (2) sqrt(3) (3) sqrt(5) (4) 3sqrt(2)

Draw the structures of the following molecules : (i) N_(2)O_(5) (ii) XeF_(2)

The mean deviation of the series a , a+d , a+2d , , a+2n from its mean is ((n+1)d)/(2n+1) (b) (n d)/(2n+1) (c) (n(n+1)d)/(2n+1) (d) ((2n+1)d)/(n(n+1))

Assign the position of the element having outer electronic configuration (i) ns^(2) np^(2) for n = 2 (ii) (n-1) d^(5) ns^(1) for n = 4 , and (iii) (n-2) f^(14) (n-1) d^(0) ns^(2) for n = 6 in the Modern periodic table.

Assign the position of the element having outer electronic configuration (i) ns^(2) np^(2) for n = 2 (ii) (n-1) d^(5) ns^(1) for n = 4 , and (iii) (n-2) f^(14) (n-1) d^(0) ns^(2) for n = 6 in the Modern periodic table.

A draws a card from a pack of n cards marked 1,2,...,n. The card is replaced in the pack and B draws a card.Then the probability that A draws a higher card than B is (n+1)2n b.1/2 c.(n-1)2n d.none of these

Draw the sbuctures of the following molecules : (i) N_(2)O_(5) (ii) XeF_(2)

Simplify each of the following: (a)\ (7^n-3\ xx\ 7^(n+1))/(20\ xx\ 7^n-2\ xx\ 7^n) (b)\ (5^n-6\ xx\ 5^(n+1))/(9\ xx\ 5^n-2^2xx\ 5^n) (c)\ (16\ xx\ 2^(n+1)-4\ xx\ 2^n)/(16\ xx\ 2^(n+2)-2\ xx\ 2^(n+2))