[HELP]

1abcdef is a 7 digit number.if a,b,c,d,e,f can be either 0 or 1,find the sum of all such 7 digit numbers

[jgogineni]

if a=0,b=1,c=2,d=3e=4,f=5 then total is 15
i am guessing plz say correct or not.

[sripriya_810]

if 1,a=0,b=1,c=1,d=1,e=1,f=1 then it is 6 or if a=1,b=1,c=1,d=1,e=1,f=1 then sum if 7 or if a,b,c,d,e,f=0 then sum is 1

[jgogineni]

Originally Posted by sripriya_810

then sum is 7

how can u explain please

[poornaravi]

helo friends,
here the problem is not that you are thinking.you have to replace a,b,c,d,e &f with 0's and 1's and then you will find a set of 7 digit numbers. i think you have to use permutations & combinations here. At the end you will have to find the sum of all those 7 digit numbers.


Thank you
poornaravi

[romeovictor04]

67555552

[code.warrior]

RV is right.
The answer to this question is = 67555552.

If anyone is interested, I've a C program written by me to calculate this sum for you, I can provide it.