How many numbers from the given set are rational numbers?
78, 1, 0,√2, 319
4
78 and 319 are rational numbers as they are expressed in the form pq.
1 and 0 are also rational numbers as they are integers and all the integers are rational numbers.
√2 is an irrational number as it is a non-terminating non-repeating decimal.
So, number of rational numbers are 4