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Find sum of following series 5+(-41)+9+(-39)+13+(-37)+17+........+(-5)+81+(-3)

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Find sum of following series 5+(-41)+9+(-39)+13+(-37)+17+........+(-5)+81+(-3)

Posted by Cbse Guide 7 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Harsh Sidhapurker 7 years, 9 months ago

The series becomes -36,-30,-24 after adding the respective numbers so here a=-36 d=6 we don't know n and an= 78 so by substituting the values of of a ,d,and an in an formula u get n and by substituting n,an and ,a in an formula u get the answer...hope it helped

1Thank You

Cbse Guide 7 years, 9 months ago

Kisi ko aata hai ??

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CBSE > Class 10 > Mathematics