A) 972
B) 974
C) 970
D) 980
Correct Answer: B
Solution :
9?s | 8?s | other | Number of ways |
1 | 1 | 2 | \[{}^{4}{{C}_{2}}\times 2\times 8\times 8=768\] |
1 | 2 | 1 | \[\frac{4!}{2!}\times 8=96\] |
1 | 3 | 0 | \[\frac{4!}{3!}=4\] |
2 | 1 | 1 | \[\frac{4!}{3!}\times 8=96\] |
2 | 2 | 0 | \[\frac{4!}{2!2!}=6\] |
3 | 1 | 0 | \[\frac{4!}{3!}=4\] |
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