1.

Let A = { x | x

Answer» `A/3 => 0,1,2 ` rem
`(a+b+c)` is a multiple of 3
`a/3 , b/3, c/3`
now re`-> 0 , 0, 0 = .^3C_3= 1`
`1,1,1 = .^3C_3= 1`
`1,2,0 = .^3C_1.^3C_1.^3C_1= 27`
`2,2,2= .^3C_3= 1`
`A = { 1,2,3,4,5,6,7,8,9}`
total subset=`27+1+1+1= 30`
option d is correct
answer


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