`1)21/20 + 31/30 + 43/42 +.....+ 111/110 + 133/132`
`= (1 + 1/20) + (1 + 1/30) + (1 + 1/42) + ...+ (1 + 1/110) + (1 + 1/132)`
`= (1 + 1 + 1 + ...+ 1) + (1/20 + 1/30 + 1/42 + ....+ 1/110 + 1/132)`
`= 8 + (1/(4.5) + 1/(5.6) + 1/(6.7) + ...+ 1/(10.11) + 1/(11.12))`
`= 8 + (1/4 - 1/5 + 1/5 - 1/6 + 1/6 - 1/7 + ...+ 1/10 - 1/11 + 1/11 - 1/12)`
`= 8 + (1/4 - 1/12)`
`= 8 + 1/6`
`= 49/6`