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как узнать является ли число членом арифметической прогрессии? Формула есть

Написать программу в ПАСКАЛЕ, которая проверяет, есть ли во введенном с клавиатуры массиве элементы с одинаковым значением. Пожалуйста подробно...

Помогите пожалуйста решить задачу.

You are giving advice to a friend. Use should or shouldn't.

a. Your friend has a bad toothache. Advise him to go to the dentist.

b. Your friend complains that he is getting fat. Advise him to keep to the diet.

c. Your younger brother listens to Metallica all day long. Advise him to stop doing it.

d. Your sister complains that she can't sleep at night. Advise her to stop drinking coffee before going to bed.

e. Your grandfather had a heart attack the previous week. Advise him to consult a doctor.