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2. If in the expansion of (1+x)15, the coefficients of (2r +3)th and (r-1)th terms are equal, then the value of r is:
A. 6
B. 5
C. 4
D. 3
6. What is the coefficient of x5 in the expansion of (1-x)-6?
A. 252
B. 250
C. -252
D. 251
12. In a binomial expansion with power 13,
A. middle term is the 7th term
B. the middle term is the average of the 6th and the 7th terms.
C. the middle term is obtained by subtracting the 6th term from the 7th term.
D. there are two middle terms, 6th and 7th
14. In the expansion of (a+b)n , n N the number of terms is:
A. n + 1
B. n
C. n - 1
D. an
15. The number of terms in the expansion of (x - y + 2z)7 are:
A. 35
B. 38
C. 36
D. 37
18. If in the expansion of (1+x)20, the coefficients of rth and (r+4)th terms are equal, then the value of r is equal to:
A. 9
B. 7
C. 10
D. 8
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