Question

Write the greatest and smallest 7 digit number having three different digits .also find their sum

Answer 1

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Since nine is the greatest decimal digit, the greatest 7-digit number would begin with as many nines as possible; since there must be three different digits in the 7-digit number, let’s begin with five nines and fill the last two places with 8 and 7:

9999987

simce the smallest seven digit number is 1000000

but we need three different digits it will be 1000002

now lets find their sum= 9999987+1000002=10999989

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