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The sum of the digits in unit place of a...

The sum of the digits in unit place of all the numbers formed with the help of 3,4, 5,6 , taken all at a time , is :

A

18

B

108

C

432

D

144

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The correct Answer is:
B
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MODERN PUBLICATION-PERMUTATIONS AND COMBINATIONS -Multiple Choice Questions - LEVEL - II
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  20. Sum of divisors of 2^(5).3^(7).5^(3).7^(2) is :

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