\frac 1 30 %2B \frac 1 42 %2B \frac 1 56 %2B \

1.	\frac 1 30 %2B \frac 1 42 %2B \frac 1 56 %2B \frac 1 72 %2B \frac 1 90 %2B \frac 1 110
Answer» 1/(56) + 1/(67) + 1/(78) + 1/(89) + 1/(910) + 1/(1011) + 1/(11*12)= (1/5 - 1/6) + (1/6 - 1/7)+ (1/7 - 1/8) + (1/8 - 1/9) + (1/9 - 1/10) +(1/10 - 1/11) + (1/11 - 1/12)= 1/5 - 1/12= 7/60 6/55

\frac 1 30 %2B \frac 1 42 %2B \frac 1 56 %2B \frac 1 72 %2B \frac 1 90 %2B \frac 1 110

Answer»

1/(5*6) + 1/(6*7) + 1/(7*8) + 1/(8*9) + 1/(9*10) + 1/(10*11) + 1/(11*12)= (1/5 - 1/6) + (1/6 - 1/7)+ (1/7 - 1/8) + (1/8 - 1/9) + (1/9 - 1/10) +(1/10 - 1/11) + (1/11 - 1/12)= 1/5 - 1/12= 7/60

6/55

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\frac 1 30 %2B \frac 1 42 %2B \frac 1 56 %2B \frac 1 72 %2B \frac 1 90 %2B \frac 1 110

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