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The enemy planes have spotted you. You need to act quickly. Solve this sequence to aim at them: 1, 4, 9, 18, 35, ?

Fact Lab

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Interesting fact:

Currently, the Army employs 476,000 Regular Army, 343,000 Army National Guard, and 199,000 Army Reserve for a total of 1,018,000 uniformed personnel, in addition to 330,000 civilian personnel.