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write the rule of the following 1. d=2 a=12 2. r=2 a=4​

Sagot :

Answer:

The sum of the first n terms is 2n2 - n, and this is square if and only if (4n - 1)2 - 8m2 = 1 for some integer m. The smallest values of n are. 1,25, 841,28561

Step-by-step explanation:

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