One and a half by one and a third by one and a quarter. By one and a 99

One and a half by one and a third by one and a quarter. By one and a 99

Original formula = 3 / 2 * 4 / 3 * 5 / 4 *. * 99 / 98 * 100 / 99 = 100 / 2 = 50 (from the numerator of the first fraction to the denominator of the last fraction can be eliminated)