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
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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)
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