What is the sum of all 5 digit numbers formed by 2,3,4,5,6?
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Answer: 145
Step-by-step explanation:
the number of 5 digit numbers 2,3,4,5,6 can form are
(repeating digit numbers) = like 22222...5x5 = 25 numbers. ....1
(non-repeating digit numbers) = 5! = 5x4x3x2x1 = 120 numbers. ....2
from 1 and 2 we have ,
- 120+25 = 145
therefore the total or sum number of numbers formed by 2,3,4,5,6 =145
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