`1+(1/4)+((1*3)/(4*8))+((1*4*7)/(4*8*12))+....=`

(x^(8)y^(4))^((1)/(4))

1+1/4 + (1xx3)/(4xx8) + (1xx3xx5)/(4xx8xx12) + "….." is equal to

The value of the series (1)/(2)+(7)/(4)+(13)/(8)+(19)/(16)+ ...... is _________

The sum of the series 1 + (1)/(3^(2)) + (1 *4)/(1*2) (1)/(3^(4))+( 1 * 4 * 7)/(1 *2*3)(1)/(3^(6)) + ..., is

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

The value of 1- 1/2(3/4) + 1/3(3/4)^(2) -1/4(3/4)^(3) + ... is:

(4)/(x)+(3)/(y)=1,(8)/(x)-(9)/(y)=7