AP EAMCET · Maths · Permutation Combination
If 5 dice are rolled simultaneously, then the number of ways of getting a total of seven of the numbers appear on their faces is
- A 12
- B 15
- C 20
- D 25
Answer & Solution
Correct Answer
(B) 15
Step-by-step Solution
Detailed explanation
The following are the cases when the sum will be (i) \(7=1+1+1+1+3={ }^5 \mathrm{C}_1\) ways \(=5\) (ii) \(7=1+1+1+2+2={ }^5 \mathrm{C}_2\) ways \(=10\) \(\therefore\) Total no. of ways \(=5+10=15\)
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