1) `A=1 - 3/(2*5) - 3/(5*8) - 3/(8*11) - ... - 3/(105*108)`

`S = (1/2 - 1/5) + (1/5 - 1/8) + (1/8 - 1/11) + ... + (1/105 - 1/108)`

`S = 1/2 - 1/108 = 54/108 - 1/108 = 53/108`

`A = 1 - 53/108 = 55/108`

2) `A = 1 * [(3/2) * 5] * [(3/5) * 8] * [(3/8) * 11] * ... * [(3/102) * 105] * [(3/105) * 108]`

`A = 1 * (3 * 5 / 2) * (3 * 8 / 5) * (3 * 11 / 8) * ... * (3 * 105 / 102) * (3 * 108 / 105)`

`A=(3^35 * (5 * 8 * 11 * ... * 105 * 108))/(2 * 5 * 8 * 11 * ... * 102 * 105)`

`A = (3^35 * 108) / 2`

`A = 2 * 3^38`