EXERCISE

$1\mathrm{.}2\mathrm{.}7$: Expressing a set of conditions using logical operations.

Consider the following pieces of identification a person might have in order to apply for a credit card:

B: Applicant presents a birth certificate.

$D$ : Applicant presents a driver's license.

$M$ : Applicant presents a marriage license.

Write a logical expression for the requirements under the following conditions:

$($a$)$ The applicant must present either a birth certificate, a driver's license or a marriage license.

$($b$)$ The applicant must present at least two of the following forms of identification: birth certificate, driver's license, marriage license.

$($c$)$ Applicant must present either a birth certificate or both a driver's license and a marriage license.