Question

if 31z2 is multiplie of 3 where z is a digit,then which of the following is the value of z? a) 8 b)2 c) 4 d)3. with explain​

Answer 1

ANSWER: c)4

STEP BY STEP :

sum of digits: 3+1+z+2

: 6+z

Let us check different values of z

& check if number is divisible by 3

Z

Sum of digits

Divisible by 3

2+0=2

2+1=3

2+2=4

2+3=5

2+4=6

2+5=7

2+6=8

2+7=9

2+8=10

2+9=11

2+10=12

z=1,4,7,10