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[" 9.",(1)/(30)+(1)/(42)+(1)/(56)+(1)/(7...

[" 9.",(1)/(30)+(1)/(42)+(1)/(56)+(1)/(72)+(1)/(90)+(1)/(110)=?,],[[" (a) "sqrt(2)(2)/(27)," (b) "(1)/(9)," (c) "(5)/(27)," (d) "(5)/(55)]]

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(1)/(20)+(1)/(30)+(1)/(42)+(1)/(56)+(1)/(72)+(1)/(90)+(1)/(110)+(1)/(132)= ?

Find the value of: (1)/(30)+(1)/(42)+(1)/(56)+(1)/(72)+(1)/(90)+(1)/(110)

Find the sum: (1)/(2)+(1)/(6)+(1)/(12)+(1)/(20)+(1)/(30)+(1)/(42)+(1)/(56)+(1)/(72)+(1)/(90)+(1)/(110)+(1)/(132)(7)/(8)( b) (11)/(12)(c)(15)/(16) (d) (17)/(18)

(1)/(1.2)+(1)/(3.4)+(1)/(5.6)+....

(1)/(1.2)+(1)/(3.4)+(1)/(5.6)+....

Find the sum : (1)/(2) + (1)/(6) + (1)/(12) + (1)/(20) + (1)/(30 ) + (1)/(42) + (1)/(56) + (1)/(72) + (1)/(90) + (1)/(110) + (1)/(132)

What is the answer (1)/(6) +(1)/(12) +(1)/(20) +(1)/(30) +(1)/(42) +(1)/(56) ?