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Thursday, January 18 2018 @ 03:52 PM CST
 Forum Index >  Test Paper Related >  Primary 6 Matters
 P6 Edward Question (Awkward Question) No. 10
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By: T0116060A (offline)  Saturday, August 10 2013 @ 08:03 AM CDT (Read 519 times)  

Q10) The digits 1, 2, 3, 4 and 5 can form 120 five-digit numbers, each without any repeating digit. What is the sum of these 120 numbers?

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By: Samuel Lim (offline)  Saturday, August 10 2013 @ 09:29 AM CDT  
Samuel Lim

Since the numbers occur w/o repetition, Sum of the 120 num= 120*1 +120*2+120*3+120*4+120*5= (1+2+3+4+5)*120=15*120=1800

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