2. If is a multiple of 9, where z is a digit, what is the value of
? You will find that there are two answers for the last problem. Why is this so?
Personalized AI Tutor and Adaptive Time Table, Self Study Material, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.
Personalized AI Tutor and Adaptive Time Table, Self Study Material, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.
Personalized AI Tutor and Adaptive Time Table, Self Study Material, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.
Personalized AI Tutor and Adaptive Time Table, Self Study Material, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.
Personalized AI Tutor and Adaptive Time Table, Self Study Material, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.
If a number is a multiple of 9, then the sum of its digit will be divisible by 9 .
Sum of digits of 31z5 = 3 + 1 + z + 5 = 9 + z
hence 9 + z have to be multiple of 9
this possible when 9 + z = 0, 9 , 18, 27 ...
since z is a single digit number this sum can only be 9 or 18 . therefore, z should be 0 or 9 .
hence two possible values of z = 0 or 9.