(99(1)/(7)+99(2)/(7)+99(3)/(7)+99(4)/(7)+99(5)/(7)+99(6)/(7)=

999((57)/(99))xx99=

The sum of first 20 terms of the sequence 0.7, 0.77, 0.777, .. , is (1) 7/9(99-10^(-20)) (2) 7/(81)(179+10^(-20)) (3) 7/9(99+10^(-20)) (3) 7/(81)(179-10^(-20))

The sum of first 20 terms of the sequence 0.7, 0.77, 0.777, .. , is (1) 7/9(99-10^(-20)) (2) 7/(81)(179+10^(-20)) (3) 7/9(99+10^(-20)) (3) 7/(81)(179-10^(-20))

The sum of the first 99terms of the series (3)/(4)+(5)/(36)+(7)/(144)+(9)/(400)+backslash*(99)/(100) (b) (999)/(1000) (c) (9999)/(10000) (d) 1

The value of 99^(50)-(99)/(1)*98^(50)+(99.98)/(1.2)97^(50)-……-(99.98)/(1.2)*2^(50)+(99)/(1)*1^(50) is