Tolong bantu nomer 1-4 pakai cara dikumpulkan besok

1. a. { b,c,d,f,g,h,j,k,l,m,n,p,q,r,s,t,v,w,x,y,z }
b. { 1,2,3,4,5,6,7,8,9 }
c. { 3,9,18,27,54,81,87 }
d. { 11,12,13,14,15,16,17,18,19,20,21,22,23,24,25….}
2. –
3. k = { -2,-1,0,1,2,3,4,5,6,7,8 }
L = { 3 }
M = { 1,2,3,4,5… }
N = { 2,4,6,8,10 }