Question

7221__ 5,Write the smallest digit and the greatest possible digit in the blank space of each of the given number so that the number formed is divisible by 3.

Answer 1

these are the following numbers:
a)722195
b)722135

Answer 2

Solution :

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Divisibility Rule of 3 :

A number is divisible by 3 if the Sum

of the digits is divisible by 3 .
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Given number 7221 _ 5

Let the required number = x

( 7+2+2+1+x+5 ) should be divisible

by 3

( 17 + x ) divisible by 3 .


smallest number = 1

i.e ( 17 + 1 ) = 18 [ divisible by 3 ]

greatest number ( 17 + 7 ) = 24

[ divisible by 3 ]

Therefore ,

722115 ,

722175 ,

Required blanks are 1 and 7

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