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A.saikrishna Frnds we can solve easily d squares of preceeding terms by knowing above 2 terms for suppose 3square is foundout as difference of above 2 squares plus 2 i.e.,difference 3+2=5 and then add to d just b4 term 2 vch square 2 b foundout ie.,here5+4=9 square 3 likewise we can find otherterms as well