Question

The last digit of the number obtained by multiplying the numbers $81\times 82\times 83\times 84\times 85\times 86\times 87\times 88\times 89$ will be

• A. 9
• B. 7
• C. 2

Answer 1

The units digit in this case would obviously be '0' because the given expression has a pair of 2 and 5 in it's prime factors.