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26 Oct 2021, 02:00
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
50% (02:36) correct
50%
(02:46)
wrong
based on 262
sessions
History
Date
Time
Result
Not Attempted Yet
A purse contains 3 quarters, 3 dimes and 2 nickels. How many different possible sets of 4 coins could be selected from the purse?
A. 6
B. 8
C. 9
D. 10
E. 18
A. 6
B. 8
C. 9
D. 10
E. 18
26 Oct 2021, 02:31
Kudos
Bookmarks
{QQQD,
QQQN,
QQDD, QQNN, QQDN,
QDDD, QDDN, QDNN,
DDDN, DDNN}
10
QQQN,
QQDD, QQNN, QQDN,
QDDD, QDDN, QDNN,
DDDN, DDNN}
10
Archit3110
26 Oct 2021, 08:48
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Bookmarks
we can solve by making all possible cases of the given set of coins 3 quarters, 3 dimes and 2 nickels
cases for quarters & dimes
3c3*3c1 ; 3c2*3c2; 3c1*3c3 ; 3 cases
cases for quarters & nickels
3c3*2c1 ; 3c2*2c2 ; 2 cases
cases for dimes & nickels
3c3*2c1 ; 3c2*2c2 : 2 cases
cases for quarters , dimes & nickels
3c2*3c1*2c1 ; 3c1*3c2*2c1 ; 3c1*3c1*2c2 ; 3 cases
total cases= 3+2+2+3 ; 10
option D
cases for quarters & dimes
3c3*3c1 ; 3c2*3c2; 3c1*3c3 ; 3 cases
cases for quarters & nickels
3c3*2c1 ; 3c2*2c2 ; 2 cases
cases for dimes & nickels
3c3*2c1 ; 3c2*2c2 : 2 cases
cases for quarters , dimes & nickels
3c2*3c1*2c1 ; 3c1*3c2*2c1 ; 3c1*3c1*2c2 ; 3 cases
total cases= 3+2+2+3 ; 10
option D
Bunuel
