The coefficient of t50 in (1 + t2)25 (1 + t25) (1 + t40) (1 + t45) (1 + t47) is :
(1)
1 + 25C5
(2)
1 + 25C5 + 25C7
(3)
1 + 25C7
(4)
None of these
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non of these are answer
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lalitatanwarstps:
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