When is “World Earth Day” celebrated?

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

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

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

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

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

How many 9’s are there in the following sequence that are immediately preceded by an odd number but not immediately succeeded by a prime number?

XB22,  VD18,  TF14,  RH10, ?

Which of the following letter-clusters will replace the question mark [?] in the given series to make it logically complete?GRM, ETL, [?], AXJ, YZI

In the given arrangement, how many numbers are between the second symbol from the right end and the third symbol from the left end?