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The Brainliest Answer!
so how man even numbers are 2,4,6...20 (10 numbers)
so it 2¹⁰
then multiples of 4  (4 numbers)
so it has 2¹⁴
then mulitples of 8 8,16 (2 numbers)
so it has 2¹⁶
then finally multiple of 16 (1 number)
so it has 2¹⁷
so maximum value of n=17
as 21!=(3×5×7..×21)(2¹⁷)(1×3×5×9)(1×3×5)(1×3)
so now u can say n=17

1 5 1
yeah mark as best
thq u
wlcm..bt i shud tq because u solvd my problm....!!
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