a train will hold 78 passengers. If it starts out empty and picks up one passenger at the first stop, 2 passengers at the second stop, 3 passengers at the third stop, and so on. After how many stops will

a train will hold 78 passengers. If it starts out empty and picks up one passenger at the first stop, 2 passengers at the second stop, 3 passengers at the third stop, and so on. After how many stops will it be full?

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A train will hold 78 passengers. If it starts out empty and picks up one passenger at the first stop, 2 passengers at the second stop, 3 passengers at the third stop, and so on.…

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