Question

what is the last digit of product of first 30 prime numbers

Answer 1

first three prime numbers are 2,3 and 5
2×3×5=30
now if we will multiply 30 by next prime number last digit will be 0
30×7=210 because on multiplying 0 with any number gives 0 as last digit
therefore last digit of product of first 30 prime numbers is 0