Latest Gate Aptitude Question SOLUTION: If two fair coins are flipped and at least one of the outcomes is known to be a head, what is the probability that both outcomes are heads?

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Previous Question: 5 skilled workers can build a wall in 20days: 8 semi-skilled workers can build a wall in 25 days; 10 unskilled workers can build a wall in 30days. If a team has 2 skilled, 6 semi-skilled and 5 unskilled workers, how long will it take to build the wall? Next Question: Four matrices M1, M2, M3 and M4 are dimensions p Ã— q, q Ã— r, r Ã— s and s Ã— t respectively can be multiplied in several ways with different number of total scalar multiplications. For example When multiplied as (( ) ( )) 1 2 3 4 M Ã—M Ã— M Ã—M the total number of scalar multiplications is pqr+rst+prt. When multiplied as ((( ) ) ) 1 2 3 4 M Ã—M Ã—M Ã—M , the total number of scalar multiplications is pqr+prs+pst. If p=10, q=100, r=20, s=5 and t=80, then the minimum number of scalar multiplications needed is??

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If two fair coins are flipped and at least one of the outcomes is known to be a head, what is the probability that both outcomes are heads?: Asked In Gate MAN (10 years ago); Unsolved Read Solution (2); Is this Puzzle helpful? (2) (0) Submit Your Solution

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Previous Question: 5 skilled workers can build a wall in 20days: 8 semi-skilled workers can build a wall in 25 days; 10 unskilled workers can build a wall in 30days. If a team has 2 skilled, 6 semi-skilled and 5 unskilled workers, how long will it take to build the wall? Next Question: Four matrices M1, M2, M3 and M4 are dimensions p Ã— q, q Ã— r, r Ã— s and s Ã— t respectively can be multiplied in several ways with different number of total scalar multiplications. For example When multiplied as (( ) ( )) 1 2 3 4 M Ã—M Ã— M Ã—M the total number of scalar multiplications is pqr+rst+prt. When multiplied as ((( ) ) ) 1 2 3 4 M Ã—M Ã—M Ã—M , the total number of scalar multiplications is pqr+prs+pst. If p=10, q=100, r=20, s=5 and t=80, then the minimum number of scalar multiplications needed is??

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