A) 140
B) 196
C) 280
D) 346
Correct Answer: B
Solution :
As for given question two cases are possible. (i) Selecting 4 out of first 5 questions and 6 out of remaining 8 questions \[={{\,}^{5}}{{C}_{4}}\,\times {{\,}^{8}}{{C}_{6}}=140\] choices. (ii) Selecting 5 out of first 5 questions and 5 out of remaining 8 questions \[={{\,}^{5}}{{C}_{5}}\,\times {{\,}^{8}}{{C}_{5}}=56\] choices. \ Total no. of choices = 140 + 56 = 196.
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