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मान लीजिए एक अनुक्रम निम्न रूप में ...

मान लीजिए एक अनुक्रम निम्न रूप में परिभाषित है :
`a_(1)=3,` तथा ` a_(n) =3a_(n-1)+1` जहाँ ` n gt 1 `
अनुक्रम के पहले चार पदों का ज्ञात कीजिए ।

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