Question
A set of 5 parallel lines is intersected by another set
of 4 parallel lines so as to form a number of parallelograms. How many parallelograms can be formed?Solution
For a parallelogram, we need 2 pairs of parallel lines. So, we can "choose" any two lines from the first set of 4 parallel lines 'and' choose any two lines from the second set of 5 parallel lines. Hence the value we need is 4C2 × 5C2 = 6 × 10 = 60 Thus 60 parallelograms are formed.
Which gas is commonly used in fire extinguishers to smother flames?
Recently Zojila Day was observed at Zojila War Memorial to celebrate the instant action by Indian troops in ‘Operation Bison’ in 1948, the day was o...
On which of the following state, Singur Dam is located?
Which of the following statements is/are correct in regards to the Economic Survey of India?
- The first Economic Survey o...
Who has been awarded with the Royal Order of Merit of the United Kingdom?
Which word was added to the Preamble of the Indian Constitution by the 42nd Amendment Act, 1976?
Recently a campaign ‘Good for You and Good For the Planet’ has just begun, who has started this campaign?
When was Subhash Chandra Bose selected in Indian Civil Service?
Who won the Formula 1 Hungarian Grand Prix 2024 in Mogyoród, Hungary?
In 2019, which Indian classical dance did Manju Barggavee contribute to, earning her the Sangeet Natak Akademi Award?