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Question

Find the sum of all the numbers that can be formed with the digits 2,3,4,5 taken all at a time.

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Solution

¯¯¯¯¯¯¯¯103 ¯¯¯¯¯¯¯¯102 ¯¯¯¯¯¯¯¯101 ¯¯¯¯¯¯¯¯¯¯¯¯100

2,3,4,5
(image )
Sum=(2+3+4+5)(100+101+102+103)
=15(1+10+100+1000)
=1111(15)
=16665

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