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( y=3 x+6 x^ 2 +10 x^ 3 + ldots infty ) হলে দেখাও যে, ( x=1 3 y-1 3^ 2 cdot 4 2 ! y^ 2 +1.4 .7 3^ 3 cdot 3 ! y^ 3 - ldots ldots ldots ) | Suva Ai