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Question

Using the digits 4,5,6,7,8, each once, construct a 5−digit number which is divisible by 132

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Solution

To check for divisibility by 132
First we factorize 132 as 132=4∗3∗11

Now, if the Number obtained is to be divided by 132 then it has to follow DivisibilityRules of 4,3 and 11 which are given below

(i) Divisibility Rule of 4 is the last 2 digits of the number should be divisible by 4

(ii) Divisibility Rule of 3 is the Sum of digits must be Divisible by 3

(iii) Divisibility Rule of 11 is Take the alternating sum of the digits in the number, read from left to right. ... So, for instance, 2728 has alternating sum of digits 2−7+2−8=−11. Since -11 is divisible by 11, so is 2728.

Now, Out of the Given Five Digits only 4,8 are satisfying (i) so last 2 digits are either 84 or 48

Now (ii) is also satisfying as Sum of digits =30

Now, we have to check (iii)
By Hit and Trial method we get


⇒ 67584 and 57684 (Also the sum of these digits is 0 as it can be either multiple of 11 or is 0 )


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