Assume that you select digits from the set {2,3,5,6,7,8} to form a number between 20 and 800. (1) How many such numbers can be formed if digits are not repeated? (2) How many such numbers can be formed if digits can be repeated?

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Assume that you select digits from the set {2,3,5,6,7,8} to form a number between 20 and 800. (1) How many such numbers can be formed if digits are not repeated? (2) How many such numbers can be formed if digits can be repeated?

Mathematics
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all 2 digit numbers are above 20 so u are good there then all 3 digit numbers that dont start with 8 are below 800
no repeition 2 digit numbers 6*5 3 digit numbers with out 8 in beginning 5*5*4
with repetition alloved 2 digit numbers 6*6 3 digit numbers 5*6*6

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Other answers:

|dw:1441335919908:dw|
oh that makes sense now :D. I got it right . By the way what you said helped on the other problem because I got it right. :D
which one again?
it was the base 8 one
oh okay thats good!
the answer was 53602
u understand bases now?
i cann check for u wait
yeah I think I do
was it right?
yeah
sry i went off writing a program hehe
:D

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