Math, asked by jadhavadi047, 9 months ago

please help me.solve this question​

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Answered by sujalpathak514
0

Answer:

I am not sure but correct answer is option B.

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Answered by ajay8949
1

\huge\mathbb{\fcolorbox{aqua}{red}{\fcolorbox{aqua}{orange}{Answer}}}

  \:  \:  \:  \:  \:  \:  \:  \:  \: \binom{a}{ \:  \:  \: 9}  = 449

 \:  \:  \:  \:  \:  \:  \:  \: a + (9 - 1)d = 449

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: a + 8d = 449 \:  \:  \:  \:  \:  \:  \:  \:  \: (i)

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \ \binom{a}{ \:  \:  \: \:  \:  \:  \:  449}  = 9

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: a + (449 - 1)d = 9

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \: a + 448d = 9 \:  \:  \:  \:  \: \:  \:  \:  \:  \:  (ii)

equation \: 2 - \: equation1

(a + 448d) - (a + 8d) = 9 - 449

a + 448d - a  - 8d = - 440

 \:  \:  \:  \:  \:  \:  \:  \:  \:  440d = - 440

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: d =  \frac{ \:  \:  \:   \:-440}{ 440}

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: d =  - 1

from \: equation \: 1

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: a + 8d = 449

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: a + 8( - 1) = 449

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: a - 8 = 449

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: a = 449 + 8

 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: a = 457

as \:  \binom{a}{ \:  \:  \: n}  = a + (n - 1)d

 \binom{a}{ \:  \:  \: n}  = 0, \\ a = 457 \\ d =  - 1

0 = 457 + (n - 1) - 1

0 = 457 - n + 1

n = 458 {}^{th}  \: term

\mathcal\orange{Please\:mark\:as\:brainliest.....}

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