Last one for today: If eight coins are tossed, in how many : DS Archive
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# Last one for today: If eight coins are tossed, in how many

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Manager
Joined: 24 Jun 2003
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Last one for today: If eight coins are tossed, in how many [#permalink]

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08 Aug 2003, 00:19
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Last one for today:

If eight coins are tossed, in how many ways can they fall
a) with at most three heads;
b) with at least six heads;
Intern
Joined: 04 Jun 2003
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08 Aug 2003, 01:14
Let me try-

a) 8C3+8C2+8C1

b)8C6+8C7+8C8

Or it can't be that easy...
SVP
Joined: 03 Feb 2003
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08 Aug 2003, 01:36
The first question:

total 93

the second:

total 37

a sanity check: total outcomes are 2^8=256; the answers seem to be relevant
08 Aug 2003, 01:36
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