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Recursionhard
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Given an=5an−1−6an−2a_n = 5a_{n-1} - 6a_{n-2}an​=5an−1​−6an−2​ with a0=1,a1=5a_0 = 1, a_1 = 5a0​=1,a1​=5, define bn=a2nb_n = a_{2n}bn​=a2n​ (extracting every second term). Which recurrence does bnb_nbn​ satisfy?