If SHADOW is coded as 184 and TEDIOUS is coded as 384, then how will VALIDATE be
coded as?

Given, 

SHADOW is coded as 184 and TEDIOUS is coded as 384

The pattern followed here is : 

• Sum of the place value of reverse alphabets of the alphabets in a given word.
• Reverse value = 27 - place value of alphabet
• $$Sum\times\ Number\ of\ vowel\ in\ word\ =\ coded\ value$$

SHADOW = 8 + 19 + 26 + 23 + 12 + 4 = 92 

$$\therefore\ 92\times\ 2=184$$

TEDIOUS = 7 + 22 + 23 + 18 + 12 + 6 + 8 = 96 

$$\therefore\ 96\times\ 4=384$$

Similarly, 

VALIDATE = 5 + 26 + 15 + 18 + 23 + 26 + 7 + 22 = 142

$$\therefore\ 142\times\ 4=568$$

Hence, Option C is correct.