A) 8th
B) 6th
C) 9th
D) 7th
Correct Answer: D
Solution :
\[\frac{^{n}{{C}_{r}}}{1}=\frac{^{n}{{C}_{r+1}}}{7}=\frac{^{n}{{C}_{r+2}}}{42}\] By solving line get r = 6 so, if is 7th term.You need to login to perform this action.
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