Consider this as 6 places to be filled up with 4 different digits out of available 10 different digits
---- ----- ---- ----- ----- -----
First Place can be filled up with 9 different digit.
Second Place can be filled up with 9 different digit.
Third Place can be filled up with 8 different digit.
Fourth Place can be filled up with 7 different digit.
5th and 6th place can be filled up with 4 different digits each.
Total possible numbers = 9 * 9 * 8 * 7 * 4 * 4 = 72576
Consider this as 6 places to be filled up with 4 different digits out of available 10 different digits
---- ----- ---- ----- ----- -----
First Place can be filled up with 9 different digit.
Second Place can be filled up with 9 different digit.
Third Place can be filled up with 8 different digit.
Fourth Place can be filled up with 7 different digit.
5th and 6th place can be filled up with 4 different digits each.
Total possible numbers = 9 * 9 * 8 * 7 * 4 * 4 = 72576
no its wrong
hi abhijith
can utell me ans is 408240
if correct then i explain u, and if wrong then try to find ansfor secondtime plz reply me
Little Star
n/a
It should be C (10, 4) x 4^6 - 4^5
It should be C (10, 4) x 4^6 - 4^5
ans is 294840 its ther e in arun sharma refer to q 30 level 3 ,i dont know how he gt that
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