There are 190 penguins standing near the beach, and then one penguin dives into the sea, followed by two penguins, then three penguins, and so on, with one more penguin in each group. How many penguins will be in the last group?
19 penguins in the last group
sum to n terms is (1+2+...+n) = n(n+1)/2 =190
Last group contains 19 penguins
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