In a certain code language, ‘WIDE’ is coded as ‘2783’ and ‘DIET’ is coded as ‘8742’. Whatis the code for ‘T’ in the given code language?

Given: 

In a certain code language, ‘WIDE’ is coded as ‘2783’ and ‘DIET’ is coded as ‘8742’.

I, D, E and 2, 7, 8 are common in both.

So, the code of T is 4.

Thus, correct option is (a).