Math, asked by hello7777, 10 months ago

if the sum of n terms of an AP is 3n^2-5n and its mth term is 164,find the value of m.
please reply fast

Daijobudesukabakka: wanna refer the calculation ?

ayushdixit867: is my answer wrong

Daijobudesukabakka: S2 is sum of 2 terms , not the 2nd term

Daijobudesukabakka: nvrmind my bad

ayushdixit867: wait...

ayushdixit867: ya...i am wrong...m=82

ayushdixit867: and S2-S1 = A2

Daijobudesukabakka: umm , my ans is coming ou to be 84 as well

ayushdixit867: no..its 82

Daijobudesukabakka: care to explain

Answers

Answered by ayushdixit867

i think that it will be 3n²+5n instead of 3n²-5n....
and if it is 3n²+5n then only it will be write......
but if it is 3n²-5n then ans. is comming in fraction which is not possible.....
So, friend plz. check your question....

Daijobudesukabakka: here, common difference comes out to be 4 not 2 ,pls check calculations

ayushdixit867: no...its 2 itself...

Daijobudesukabakka: 1st term = -2

ayushdixit867: send me your ans.

Daijobudesukabakka: 2nd term = 2

Daijobudesukabakka: guess the cd

Answered by Daijobudesukabakka

Answer

The values given in the question are to be confirmed , the final answer is not a whole number if we use these values

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if the sum of n terms of an AP is 3n^2-5n and its mth term is 164,find the value of m.please reply fast

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if the sum of n terms of an AP is 3n^2-5n and its mth term is 164,find the value of m.
please reply fast