Question

. If 78*3945 is divisible by 11, where * is a digit,
then * is equal to​

Answer 1

Answer:

5

Explanation:

A number is divisible by 11, if the difference of the sum of its digits at odd places and the sum of its digits of even places, is either 0 or a number divisible by 11.

∴ (5 + 9 + * + 7) – (4 + 3 + 8) = 0 or multiple of 11

⇒ 21 + * – 15

∴ * + 6 = a multiple of 11

∴ * = 5