Which letter-cluster will replace the question mark (?) to complete the given series?

AVTE CTRG ERPI GPNK   ?

Direction: Read the following information carefully and answer the given questions:

There are nine people A, B, C, D, E, F, G, H and I who all live in different cities such as Mumbai, Kolkata, and Jaipur but not necessarily in the same order. Not more than three people live in the same city and at least two people live in the same city. A neither live in Mumbai nor in Kolkata. D and G are friends but live in different cities but none of them lives in Jaipur. Either H or F lives in Kolkata. B and G live in the same city but it's not Mumbai. I, E and D are friends and the two of them live in the same city. E and H live in the same city but not Mumbai.

Which of the following is true?

In a certain code language, 'PLANNED' is written as 'RNCNPGF' and ‘PROMOTE’ is written as ‘RTQMQVG’. How will 'IMPROVE' be written in that language?

Four clusters have been given out of which three are alike in some manner and one is different. Select the one that is different.

Option

In a certain code language, 'STAR’ is coded as '92678' and 'FLAG' is coded as '20261521'. How will 'LOGO' be coded in that language?

If A denotes ‘+’, B denotes ‘×’, C denotes ‘−’ and D denotes ‘÷’, then what will come in place of ‘?’ in the following equation?
 (13 B 9) D 3 A (14 D 7) B 6 C 21 A (32 B 2) = ? 

Which letter cluster will replace the question mark (?) to complete the given series?
 ANGE, DSBB, GXWY, ?

By interchanging the given two signs which of the following equation will be not correct?
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