Question

Find unit digit of product (173)45*(152)77*(777)999.

Answer 1

unit digit means last digit of every no.

so,

taking only last digit of every no.

3×5 =15

so, unit digit is 5

now, 7×2 =14

so, 4

7×9 =63

so,3

now multiply all unit digits

so,

5×4×3 =60

therefore, unit digit is 0