Question

1/30+1/42+1/56+1/72+1/90+1/110+1/132

Answer 1

0.11666666666 ........................................

Answer 2

= 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