Advertisement Remove all ads

A Group of 630 Children is Arranged in Rows for a Group Photograph Session. Each Row Contains Three Fewer Children than the Row in Front of It What Number of Rows is Not Possible? - Mathematics

MCQ

A group of 630 children is arranged in rows for a group photograph session. Each row contains three fewer children than the row in front of it. What number of rows is not possible?

Options

  • 3

  • 4

  • 5

  • 6

Advertisement Remove all ads

Solution

6

Explanation:

Let no of children be x, x + 3, x + 6, x + 9, x + 12, x + 15......

Present in Rows R1 ,R2, R3, R4, R5, R6 ....... respectively Putting R = 3, 4, 5 and 6

We see that when R = 6

x + x + 3 + x + 6 + x + 9 + x + 12 + x + 15 = 630

6x + 45 = 630

6x = 585

x = 97.5

then x is not an integer.

So R = 6 does not satisfies.

Concept: Permutation and Combination (Entrance Exam)
  Is there an error in this question or solution?
Advertisement Remove all ads
Advertisement Remove all ads
Advertisement Remove all ads
Share
Notifications

View all notifications


      Forgot password?
View in app×