81.Find the term independent of x in the expansion of:
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82.Find the term independent of x in the expansion of:
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83.Find the term independent of x in the expansion of:
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Long Answer Type
84.
The absolute term in the expansion of: is 405. Find value of k.
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85.Show that the co-efficient of the middle term in the expansion of (1 + x)2n is equal to the sum of the co-efficients of two middle terms in the expansion of (1 + x)2n-1
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86.
Find a, b and n in the expansion of if the first three terms of the expansion are 729, 7290 and 30375, respectively.