The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is:
A. 20
B. 30
C. 40
D. None of these » Read More…
B. 30
C. 40
D. None of these » Read More…
B. 18
C. 6
D. 9
A. 18
B. 7
C. 9
D. 16
A. 1.3 sec
B. 10 min 50 sec
C. 5min
D. 8min 20 sec
B. 10.5 sec
C. 5min
D. 8min 40 sec