` A = 1 + 3 + 5 + ... + 331`
` A = \frac{(1+331)[(331-1) : 2 + 1]}{2}`
` A = \frac{332 . 166}{2}`
` A = 55112/2`
` A = 27556`
`_________________________________________`
`B = \frac{5}{1.2} + \frac{5}{2.3} + ... + \frac{5}{19.20}`
` B = 5(\frac{1}{1.2} + \frac{1}{2.3} + ... + \frac{1}{19.20})`
` B = 5( 1 - 1/2 + 1/2 - 1/3 + ... + 1/19 - 1/20)`
` B = 5( 1 - 1/20)`
` B = 5 . 19/20 `
`B = 19/4`