Q:

Which number best completes the sequence: 2, 9, 5, 13, 10, 19 and 17?

A:

The number 17 best continues the following sequence: 2, 9, 5, 13, 10, 19. A sequence, in math terms, is a set of numbers organized in some sort of pattern. To find the next number in the sequence, the problem's solver must first figure out the pattern.

The differences between the numbers are 7, -4, 8, -3 and 9. The numbers switch on and off from adding or subtracting. Every time a number is added, it is one higher than the last number that was added. In the pattern so far, the positive numbers are 7, 8, and 9. Every time a number is subtracted, it is one less than the last subtraction. The negative numbers so far are -4, and -3. Using this pattern, the next number is 2 less than the last number in the sequence, 19. So, the answer is 17.

Sources:

  1. mathsisfun.com

Is this answer helpful?

Similar Questions

  • Q:

    What is the Feynman point?

    A:

    The Feynman point is a sequence of six nines commencing at the 762nd place of the decimal representation of pi. The Feynman point is named after the theoretical physicist Richard Feynman.

    Full Answer >
    Filed Under:
  • Q:

    What are consecutive prime numbers?

    A:

    Consecutive prime numbers refers to a sequence of two or more prime numbers that are next to each other with no other prime numbers in between. A prime number is a number that is larger than one and that can only be divided evenly by one and itself.

    Full Answer >
    Filed Under:
  • Q:

    Is zero an even number?

    A:

    In math, zero is considered to be an even number. In order to be even, a number must be able to be divided exactly by two. Zero qualifies because zero divided by two equals zero.

    Full Answer >
    Filed Under:
  • Q:

    What is a number multiplied by itself called?

    A:

    A number that is multiplied by itself is called a base when it is written in exponential notation. Exponential notation consists of the number to be multiplied and a numeral in superscript to the right of it to indicate the number of times it is to be multiplied by itself.

    Full Answer >
    Filed Under:

Explore