Find the missing letter in the series: m, n, p, q, ?

A. R

What is the root word in the term 'unhappiness'?

A. HAPPY

In a code, 'APPLE' is represented as '1-16-16-12-5'. What is the code for 'GRAPE'?

A. 7-18-1-16-5

In a coded system, 'CLOUD' is coded as '45678', 'SHINE' is coded as '12345', and 'MIND' is coded as '6789'. What is the code for 'DUNE'?

D. 6785

Which of the following words is formed by adding a suffix to the root word 'educate'?

A. EDUCATION