In a triangular seating area, the seats are arranged in rows so that the 1st , 2nd , 3rd and 4th etc. Rows contain 1, 2, 3, 4 etc. seats and so on. 70 students take seat starting from the first row and filling up the rows in increasing order. How many rows are completely filled?

In a triangular seating area, the seats are arranged in rows so that the 1^st , 2^nd , 3^rd and 4^th etc. Rows contain 1, 2, 3, 4 etc. seats and so on. 70 students take seat starting from the first row and filling up the rows in increasing order. How many rows are completely filled?

A 9

B 10

C 11

D 12

Solution

Correct Answer: Option C

Solution

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