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![[Post New]](/templates/default/images/icon_minipost_new.gif) 6 Sep 2008 09:41:54 IST
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The sum of last ten coefficients in the expansion of (1+x )19 wen expanded in the ascending power of x is.......
a)218
b)219
c)218 - 19C10
d)1/2(219 - 1)
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6 Sep 2008 10:08:06 IST
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a)218
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6 Sep 2008 10:43:56 IST
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how??????
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6 Sep 2008 11:58:50 IST
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19
19co+19c1+.......................19c18+19c19=2
but
19co=19c19,19c1=19c18,............
therefore,
last and first ten co efficients are equal
19
hence sum of last ten coeffients =2 /2
18
=2
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