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siril

· started a discussion

· 1 Months ago

siril (Question: 117749.0 )

explanation is not clear

Question:
A five digit number is taken. Sum of the first four digits (excluding the number at the units digit) equals sum of all the five digits. Which of the following will not divide this number necessarily?
Options:
A) 10
B) 2
C) 4
D) 5
E) None of these
Solution:
Ans (c) The essence of this question is in the fact that the last digit of the number is 0. Naturally, the number is necessarily divisible by 2,5 and 10. Only 4 does not necessarily divide it.

Knowledge Expert

· commented

· 1 Months ago

sum of first four digits = sum of all digits.
therefore, digit at unit place is 0.
thus, by eliminating the options..

ans is 4 (as 2,5 and 10 will always divide a no. ending with 0)
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