Let P be the statement "dataendflag is off," Q the statement "error equals 0," and R the statement "sum is less than 1,000." Express the following sentences in symbolic notation:
a. P∧Q∧R
b. P∧¬Q
c. P;¬Q∨R
d. ¬P∧Q∧R
e. P∨(Q∧¬R)