I need some help these discrete math questions:
For each part below, ﬁnd the number of passwords that ﬁt the condition.
(a) The password has 10 alphanumeric characters, but is not case-sensitive.
(b) The password has 10 to 12 alphanumeric characters, and is case-sensitive.
(c) The password has 10 case-sensitive alphanumeric characters, and
exactly 3 of them are numerical.
(d) The password has 10 case-sensitive alphanumeric characters, exactly 3 of
them are numerical, and no numerical character is repeated.

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a) I found like 36^10 but I'm not sure..

if alphanumeric defines just letters and numbers, then yes, there are 36 options for each position.

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