in a row Pramod is 7th from the left and Prakash is 9th from the right. both of them interchange their position. Pramod becomes 11th from the left. how many people are there in the row?
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A is 7 from left and B is 9th from right ... now A takes B's place and then A gets 11th from left means the 11th place from left at where A stands now is actually 9th place from right so 11+8=19 is total row size.
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