Please write down the detailed steps, and mark the knowledge points of each step. This is the topic of probability theory. thank you

E. [E peints] Consider twe ips ef a min. Let X1 be the randem variable which is 1 if the rst min is heads and etherwise; let X3 be the randem variable which is 1 if the seeend eein is he ads and I] DthEI'WiEE; and let X3 be the randenl variable which is 1 if the twe eeins are the same and etherwise. Shew that these three variables are pairwise independent but net independent