Which of the following is an open source software

Arun said "Deepak's mother is the mother of my father's wife". How is Deepak related to Arun?

Shamita's birthday was on 15 March 2020, which was a Sunday. If her husband's birthday was on 31 May 2020, on which day would it fall?

Select the set in which the numbers are related in the same way as are the numbers of the following set.

Statements:

Some shells are pebbles.

All pebbles are rocks.

Conclusions:

I. No shell is a rock.

Identify the figure from the given options that when put in place of the question mark (?) will logically complete the series.

In a certain code language, ‘PAINT’ is written as ‘ODYTN’ and 'BRUSH' is written as 'CMMOZ'. How will ‘HOUSE’ be written in that language?

Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.

DI, GO, LU, OA, TG, ?

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

BELL, CGIH, ?, EKCZ, FMZV