40. In a class of 80 students, sixty percent use neither an iPhone nor an iPad. Twenty percent use aniPhone, while thirty percent use an iPad. How many students in this class are using an iPhone oran iPad?41. In a class of 80 students, sixty percent use neither an iPhone nor an iPad. Twenty percent usean iPhone, while thirty percent use an iPad. How many students in this class are using both aniPhone and an iPad?42. Determine if the following argument is valid or invalid. State if valid or invalid and the the law orfallacy used to support your answer. If it rains, I can not go fishing. It did not rain. Therefore, Ican go fishing.43. Determine if the following argument is valid or invalid. State if valid or invalid and the the lawor fallacy used to support your answer. [(-p → q) ^ q] → -p44. Determine if the following argument is valid or invalid. State if valid or invalid and the the lawor fallacy used to support your answer. [((pAq) →¬r) Ar] → -¬(p^q)45. Determine if the following argument is valid or invalid. State if valid or invalid and the the lawor fallacy used to support your answer. I will attend the party if my parents will allow me to go.My parents did not allow me to go to the party. I did not attend the party.

Since you have posted a multiple question according to guildlines I will solve first question(i.e…

Answered: 40. In a class of 80 students, sixty…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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40. In a class of 80 students, sixty percent use neither an iPhone nor an iPad. Twenty percent use an iPhone, while thirty percent use an iPad. How many students in this class are using an iPhone or an iPad?