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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Ashish sharma
80 option-B is correct,. We generally use tally bars to count the frequency in a series. Whenever an item occurs in a series, it is represented by a ‘|’. This is an item occurs 4 times then it is represented as ||||. One important point to remember is that we represent the fifth occurrence by crossing the four tally bars. This is the four and cross method.