Ariana, boris, cecile, and diego are students in the service club. three of the four students will be chosen to attend a conference. which choice represents the sample space, s, for this event?

s = {abc, abd, acd, bcd}
s = {abc, bca, cda, dac}
s = {abc, abd, bac, bda, acd, adc, bcd, bdc}
s = {abc, abd, acd, bca, bcd, bdc, cab, cbd, dac, dbc}

Can someone 50 first drop menu 0.80 or 0.75 or 1.20 or 4.00 second drop menu 4.00 or 0.75 or 0.25 or 3.75 3rd 15,6,10, or 9 4th yes or no

Find the multiplicative inverse of 8-12i

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling