`S = 1/( 1 . 4 ) + 3/( 4 . 7 ) + 3/( 7 . 10 ) + .... + 3/( 40 . 43 ) + 3/( 43 . 46 )`
`S = 1/1 - 1/4 + 1/4 - 1/7 + 1/7 - 1/10 + .... + 1/40 - 1/43 + 1/43 - 1/46`
`S = 1 - 1/46`
`S = 45/46`
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`A = 1/( 1 . 4 ) + 1/( 4 . 7 ) + .... + 1/( 19 . 22 )`
`A . 3 = 3/( 1 . 4 ) + 3/( 4 . 7 ) + .... + 3/( 19 . 22 )`
`A . 3 = 1/1 - 1/4 + 1/4 - 1/7 + .... + 1/99 - 1/22`
`A . 3 = 1 - 1/22`
`A . 3 = 21/22`
`A = 21/22 : 3`
`A = 7/22`
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`B = 1/6 + 1/12 + 1/20 + 1/30 + .... + 1/110`
`B = 1/( 2 . 3 ) + 1/( 3 . 4 ) + 1/( 4 . 5 ) + .... + 1/( 10 . 11 )`
`B = 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 + .... + 1/10 - 1/11`
`B = 1/2 - 1/11`
`B = 9/22`
