Adv
AnilSinghBora
  • 0
Guru

Explain why 7 × 11 × 13 + 13 and 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5 are composite numbers. Q.6

  • 0

The important question of class 10th of chapter real numbers how can i solve this question. This is the important question. I don’t the solution of this question. How can solve this question Explain why 7 × 11 × 13 + 13 and 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5 are composite numbers.

Share

1 Answer

  1. By the definition of composite number, we know, if a number is composite, then it means it has factors other than 1 and itself. Therefore, for the given expression;

    7 × 11 × 13 + 13

    Taking 13 as common factor, we get,

    =13(7×11×1+1) = 13(77+1) = 13×78 = 13×3×2×13

    Hence, 7 × 11 × 13 + 13 is a composite number.

    Now let’s take the other number,

    7 × 6 × 5 × 4 × 3 × 2 × 1 + 5

    Taking 5 as a common factor, we get,

    =5(7×6×4×3×2×1+1) = 5(1008+1) = 5×1009

    Hence, 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5 is a composite number.

    • 0
Leave an answer

Leave an answer

Browse

Choose from here the video type.

Put Video ID here: https://www.youtube.com/watch?v=sdUUx5FdySs Ex: "sdUUx5FdySs".

Captcha Click on image to update the captcha.

Related Questions