1.

(i) What is the second term in the expansion of (1 + x)^(n)? (ii) Write the 3^(rd) and 4^(th) terms in the expansion of (1 + x)^(n). (iii) If the coefficients of 2^(nd), 3^(rd) and 4^(th) terms in the expansion of (1 + x)^(n) are in A.P, then show that n^(2) - 9n + 14 = 0.

Answer»


ANSWER :(i)` = nx`, (II)` = (n(n - 1)(n - 2))/6X^(3)`, (iii)` = 0`


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