((13)^(3)+7^(3))/((13)^(2)+7^(2)-?)=20

Find x , if (13^3 + 7^3)/(13^2 + 7^2 - x) = 20

2 3/5-:5/7=\ (13)/7 (b) (13)/(25) (91)/(25) (d) (25)/(91)

(5) / (3 ^ (2) 7 ^ (2)) + (9) / (7 ^ (2) 11 ^ (2)) + (13) / (11 ^ (2) 15 ^ (2)) + .... oo

Find the sum of series :- (3)/(2)+(7)/(6)+(13)/(12)+(21)/(20)... if the no of terms is 2007.

Find : a. 4 (5)/(13)- 3 (7)/(13) + 2 (8)/(13)

The distance of the point P(1,-3) from the line 2y-3x=4 is (A) 13 (B) (7)/(13)sqrt(3) (C) sqrt(13) (D) (7)/(13)

2 3/5-:5/7=\ (a) (13)/7 (b) (13)/(25) (c) (91)/(25) (d) (25)/(91)

Find the sum of the infinite series (1.3)/(2)+(3.5)/(2^(2))+(5.7)/(2^(3))+(7.9)/(2^(4))+......oo

Re-arrange suitably and find the sum in each of the following: (3)/(5)+(7)/(3)+(9)/(5)+(-13)/(15)+(-7)/(3) (ii) (4)/(13)+(-5)/(8)+(-8)/(13)+(9)/(13)