A 3-digit number 4a3 is added to another 3-digit number 984 to give a 4-digit number 13b7, which is divisible by 11. Then, (a + b) = ?	Choose the most appropriate option:	A) 10	B) 11	C) 12	D) 15	E) 16
4 a 3 |   9 8 4 } ==&gt; a + 8 = b ==&gt; b - a = 8   13 b 7 |   Also, 13 b7 is divisible by 11 =&gt; (7 + 3) – (b + 1) = (9 – b)   (9 – b) = 0   b = 9   (b = 9 and a = 1) =&gt; (a + b) = 10.   10nswer 10
<result>A</result>
A 3-digit number 4a3 is added to another 3-digit number 984 to give a 4-digit number 13b7, which is divisible by 11. Then, (a + b) = ?