A die is tossed thrice, find the probability of an odd number at least once-

7/8

Probability of getting an odd number in a single through of a die = 3/6 = 1/2

Similarly, probability of getting an even number = 3/6 = 1/2

Probability of getting an even number three times = (1/2)x(1/2)x(1/2)

                                                                         = 1/8

Therefore, probability of getting an odd number art least once = 1 -(probability of getting an odd number in none of the throws)

                                                                                          = 1 - (probability of getting an even number thrice)

                                                                                          = 1- (1/8)

                                                                                          = 7/8