A straight-line segment is 36 cm long. Points are to be marked on the line from both the end points. From each end, the first point is at a distance of 1 cm from the end, the second point is at a distance of 2 cm from the first point and the third point is at a distance of 3 cm from the second point and so on. If the points on the ends are not counted and the common points are counted as one, what is the number of points?
Explanation & Solution
Correct Option: (B) 12
From left: points at 1,3,6,10,15 cm. From right: points at 35,33,30,26,21 cm. Total unique points = 12 (including overlap at 18 cm).
हिंदी में प्रश्न एवं आदर्श उत्तर
A straight-line segment is 36 cm long. Points are to be marked on the line from both the end points. From each end, the first point is at a distance of 1 cm from the end, the second point is at a distance of 2 cm from the first point and the third point is at a distance of 3 cm from the second point and so on. If the points on the ends are not counted and the common points are counted as one, what is the number of points?
सही उत्तर: (B) 12
From left: points at 1,3,6,10,15 cm. From right: points at 35,33,30,26,21 cm. Total unique points = 12 (including overlap at 18 cm).