- What is the reciprocal of 4/5???

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Find a2 and a3 for the geometric sequence. 64, a2, a3, 125/8 , ... a2 = a3 =? A geometric sequence begins 15, 3, 3/5, 3/25, 3/125,.... Find the common ratio r for this sequence.? additional questions in comments.? -3/8-1/2 subtraction? Find the sum of the indicated number of terms of the geometric sequence.
10, 4, 8/5, ...; n = 5? This is picture of my angiography plz let me know according to this collateral circulation revealed?