JEE Mains · Maths · STD 11 - 14. probability
A board has 16 squares as shown in the figure:
Out of these 16 squares, two squares are chosen at random. The probability that they have no side in common is :
- A 7/10
- B 4/5
- C 23/30
- D 3/5
Answer & Solution
Correct Answer
(B) 4/5
Step-by-step Solution
Detailed explanation
\begin{aligned} & \text { Total }={ }^{16} \mathrm{C}_2 \\ & \text { Required ways }=\text { Total }- \text { (adjacent square) } \\ & ={ }^{16} \mathrm{C}_2- \\ & \text { [3 pair in vertical \& horizontal for } \\ & \text { each row and column] } \\ & ={ }^{16} C_2-[3 \times…
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