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Answer 28-
28+28+28=84
hydrgn
first no. : n
second no. : n+1
third no. : n+2

n+n+1+n+2 = 84
3n + 3 = 84
3n = 81
n = 27

hence, the largest no. will be n+2,
largest no. = 27+2
= 29