(1)/(4)+(1.3)/(4.6)+(1.3.5)/(4.6.8)+

1/(2.4) +(1.3)/(2.4.6)+(1.3.5)/(2.4.6.8)+.............oo is equal to

(1)/(2.4)+(1.3)/(2.4.6)+(1.3.5)/(2.4.6.8)+(1.3.5.7)/(2.4.6.8*10)+....oo is equal to

(1)/(2.4)+(1.3)/(2.4.6)+(1.3.5.7)/(2.4.6.8*10)+.........oo is equal to

5(1)/(6)-3(1)/(4)+3(1)/(3)+4

The sum of the series: (1)/(1*2*3*4)+(1)/(3*4*5*6)+(1)/(5*6*7*8)+...+oo

(1)/(3)x+(1)/(4)y=4,(5)/(6)x-(1)/(8)y=4

If A= {1, 2, 3}, B= {3, 4} and C= {4, 5, 6}, then (A xx B) uu (A xx C) = {(1, 3), (1,4), (1,5), (1,6), (2,3), (2,4), (2,5), (2,6), (3,3), (3,4), (3,5),(3,6)}