Question

All even numbers from 2 to 98 inclusive, except those ending in 0, are multiplied together what is the rightmost digit (the units digit) of the product?

a) 0
b) 2
c) 4
d) 6

Answer 1

Ans is 6

first multifly all numbers ending with 2 those are 2*12*22*32*42.......*92=2^10=4 is last digit

multify all numbers ending with 4=4^10=6 last digit

multify all numbers ending with 6=6^10= 6 last digit

multifly all numbers ending with 8=8^10=4 last digit

so 4*6*6*4=6 last digit