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GCD & LCMhard
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An arithmetic sequence has first term a1=5a_1 = 5a1​=5 and common difference d=7d = 7d=7. The first four terms are 5, 12, 19, 26. What is gcd⁡(5,12,19,26)\gcd(5, 12, 19, 26)gcd(5,12,19,26)?