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If the nth term of arithmetic …

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If the nth term of arithmetic progression is, -1,4,9,14...............129. Find the value of n.

Posted by Payal Priyadarshani Pati 7 years, 2 months ago

CBSE > Class 10 > Mathematics

5 answers

Aayushi Tyagi 7 years, 2 months ago

Use formula an =a+(n-1)×d 129=-1+(n-1)×5 130=5n-5 135÷5=n 27=n

Aayushi Tyagi 7 years, 2 months ago

Its 27

. . 7 years, 2 months ago

Ram here l is not 149 its 129

Himanshi Sharma 7 years, 2 months ago

N=31

Ram Kushwah 7 years, 2 months ago

Here a=-1, d=4-(-1)=4+1=5 , l=149

so 149=-1+(n-1)x5

149=-1+5n-5

5n=149+6=155

so {tex}\begin{array}{l}n=\frac{155}5=31\\\end{array}{/tex}

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