Parts of the following sentence are given as options. Identify the segment that contains a grammatical error

Instead of attend the class he went to watch the cricket match.

Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.

If 4Ω8 = 64, 8Ω3 = 48 and 2Ω8 = 32, then find the value of 7Ω9 = ?

Select the related number from the given alternatives:

14 : ? :: 13 : 2198

Theatre : Actor :: Field : ?

If 47 @ 18 = 18' and 28 @ 44 = 8', then 54 @ 27 = ?'. What will come in place of question mark?

If ‘L’ is coded as '24' and 'LAP’ is coded as '58' then how will ‘LAPTOP’ be coded?

Based on the relationship between first two words, find out the missing word.

Amphibian: Frog ::   Terrestrial: ?