Trick: The direct method to check the divisibility by 7
In various jobs and Admission tests in universities the divisibility plays vital role to save the time for attempting the question.
A number is divisible by 7 if it satisfies below steps
(1).Remove the last digit
(2).Double the last digit
(3).Number _Double the number
(4).Repeat all the above three steps until you get single digit number
(5).If the final digit is divisible by 7 then the given number is divisible by 7
(6).If the final digit is not divisible by 7 then given number is not divisible by 7
Example
(1).Check whether 4088 is divisible by 7 or not
Solution
4088
408-16
392
39-4
35
3-10
-7
Hence -7 is divisible by 7
So the number 4088 is divisible by 7
(2).Check whether 6571 is divisible by 7 or not
Solution
Follow the above steps
657-2
655
65-10
55
5-10
-5
Hence -5 is not divisible by 7
So the 6571 is not divisible by 7
Which one of the following is not divisible by 7
A.6754
B.5465
C.2401(Correct
D.5617
Try, Divisibility by 7, yourself
(I).343 (ii).16807 (iii).27195
Countable and Uncountable sets-Matrices
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