What is the value of $(576 +789) mod\, 9$
Answer & explanation
Correct answer: option 1
The correct answer is option (1) : 6
$(576+789)mod\, 9$
$≡576(mod\, 9)+ 789(mod\, 9)$
$≡0(mod\, 9) + 6(mod\, 9)$
$≡(0+6)mod\, 9$
$≡ 6 (mod\, 9)$
$∴(576 +789) mod\, 9 = 6$