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Student speaks. In this class I will teach you arithmetic progression through exercises in a way you've never seen before. I hope you like it. ????CLASSIC QUESTIONS: https://bit.ly/3eHOK6A ????FOLLOW ON INSTAGRAM:https://goo.gl/bMPqqu ????CHANNEL TELEGRAM GROUP: https://t.me/joinchat/KPHpNxKal0H6mNH... Calculate the value “????” so that the sequence (4????−1, 3????+6, 6????+1) is an arithmetic progression. In a PA we have: a_1=18 and a_5=6. Calculate r. If the fifth term of an AP is equal to 8 and the tenth is equal to 22, then find the first term and the ratio. Insert 8 arithmetic means between the numbers 2 and 74. The sum of the first 15 terms of the sequence (−2, 1, 4, 7, …) is worth: a) 260 b) 285 c) 330 d) 345