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Q.
The sum of all 4 digit numbers that can be formed by using the digits 2, 4, 6, 8 (repetition of digits not allowed) is
A.
133320
B.
533280
C.
53328
D.
52238
E.
None of the above
View Answer
Correct choice: A
Explanation:
Sum of the digits in the unit place is 6(2+4+6+8)=120 units. Similarly, sum of digits in ten place is 120 tens and in hundredth place is 120 hundreds etc. Sum of all the 24 numbers is 120(1+10+10
2
+10
3
)=120×1111=133320.
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