It is basically very conceptual question !
(a)(a+1)(a+2)(a+3)(a+4)(a+5) = 720
(a)(a+1)(a+2)(a+3)(a+4)(a+5)=1X2X3X4X5X6 ( since 1X2X3X4X5X6=720 )
hence a = 1
And consecutive numbers equal to 1,2,3,4,5,6,
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