if an=4n+1 the an-1 is (a) 4n-5(b)4n-3(c) 2n+3(d)4n-6
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x में inse u₹ch zfzxyzgzkzpzpssuysjdys9shztxhudheg द् jdidm
osnis7eo2y83n37j6n6ehtskdusns
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