Question

How many straight lines can be drawn by joining 10 points on a circle?

• A. ${}^{55}{C}_8{\times }^5{C}_2$
• B. ${}^8{C}_3{\times }^5{C}_3$
• C. $344$
• D. $45$

Answer 1

The correct option is D $45$

To draw a straight line we need minimum 2 points

Also if points are drawn on a circle then we pnly need 2 points to form a straight lines

We have 10 pointt so number of strAaight lines drawn is

${}^{10}{C}_2=45$