17, In an AP, a1=7, a4=22. Find a3., 3, In a GP, a2=12, a4=108. Find the common ratio., 7, AP with a5=19, common difference 3. Find a1., 8, GP with a1=16, a3=4. Find a2, 1.95, AP with sum of first 20 terms = 530, first term = 8. Find d..

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