number of numbers greater than 1000 from the digit 1 12340 taken at 4
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This question requires that we use the concept of combination since it involves arrangement of objects in this case digits without a specific order.
The formulae for combination is:
C(n, r) =n! /(n-r)! r!
where n is the total number of objects and r the number of objects taken at a time.
In this case n=6, r=4
Solving:
6!/(6-4)!4!
(6×5×4×3×2×1)/(2×1×4×3×2×1)=15
Therefore there are 15 numbers greater than 1000.
The formulae for combination is:
C(n, r) =n! /(n-r)! r!
where n is the total number of objects and r the number of objects taken at a time.
In this case n=6, r=4
Solving:
6!/(6-4)!4!
(6×5×4×3×2×1)/(2×1×4×3×2×1)=15
Therefore there are 15 numbers greater than 1000.
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