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In TCP 3-way handshake, 3 segments will be sent (SYN, SYN/ACK, ACK). What happens if the third segment(ACK) is lost?

In TCP 3-way handshake, 3 segments will be sent (SYN, SYN/ACK, ACK). What happens to the destination host if the source host fails to acknowledge the SYN/ACK segment? (In other words third segment ACK is lost)