Question

for a number greater than 20 to be Prime what may be the possible digit in the units place​

Answer 1

Answer:

Step-by-step explanation:

it has to be 1 , 3 , 7 or 9

21 is not prime but 31 is

33 is not prime but 23 is

27 is not prime but 47 is

49 is not prime but 29 is