Introducing a lady, a lady said, "She is the only daughter of Mohan's grandfather who is my husband's father". How does the lady relate herself with the introduced lad

Which one number when placed at the sign of interrogation shall complete the series
3, 6, 18, 72, ...?..., 2160

Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
g f e _ i g_e i i _f e i_g f _i i

Arrange the following words as per order in the dicitonary
1) Pearl 2) Peasant 3) Pea 4) Peanut

For the following questions
Find the odd word/letters/number pair from the given alternatives

For the following questions
Find the odd word/letters/number pair from the given alternatives