How many distinct sums can be formed with the consecutive numbers 3, 4, 5, and 6 by placing + and - signs?

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Q1.

Which of the following numbers can be expressed as the sum of two consecutive numbers?

Q2.

Is it possible to express the number 10 as a sum of consecutive numbers in more than one way?

Q3.

What is the smallest odd number that cannot be expressed as a sum of two consecutive integers?

Q4.

Which of the following statements is true regarding even numbers and sums of consecutive numbers?