class 10th math exercise 5.3 question 3(vi) in hindi

Er Chandra Bhushan
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 Bihar board class 10th math exercise 5.3 question 3(vi) in hindi

Ncert class 10th math exercise 5.3 Q3(vi) in hindi

 3(vi) рдПрдХ AP рдоें ,a=2 d=8 рдФрд░ Sn=90 рджिрдпा рд╣ै। n рдФрд░ an рдЬ्рдЮाрдд рдХीрдЬिрдП। 

рд╣рд▓ : рджिрдпा рдЧрдпा рд╣ै рдХि a=2 , d=8 рдФрд░ Sn =90 рд╣ै। 

рдЪूँрдХि  Sn =90

рдЗрд╕ीрд▓िрдП , (n/2)[2a+(n-1)d]=90 

(n/2)[2×2+(n-1)×8]=90 

(n/2)[4+8n-8]=90 

n[4+8n-8]=90×2

4n+8n^2-8n=180

8n^2-4n=180

8n^2-4n-180=0

2n^2-n-45=0 (рджोрдиों рддрд░рдл 4 рд╕े рднाрдЧ рджेрдиे рдкрд░)

2n^2-(10-9)n-45=0 

2n^2-(10n-9n)-45=0 

2n^2-10n+9n-45=0

2n(n-5)+9(n-5)=0

(n-5) (2n+9)=0 

(n-5)=0 рдпा  (2n+9)=0  

n=0+5  рдпा  2n=0-9

n=5  рдпा  2n=-9

n=5  рдпा  n=(-9/2)

рдпрд╣ाँ n = (-9/2) рдЕрдоाрди्рдп рд╣ै рдХ्рдпोंрдХि n рдХा рдоाрди рдк्рд░ाрдХृрдд рд╕ंрдЦ्рдпा рд╣ोрддा рд╣ै। 

рдЕрд░्рдеाрдд n=5 рд╕рд╣ी рдоाрди рд╣ै рдХ्рдпोंрдХि n рдПрдХ рдк्рд░ाрдХृрдд рд╕ंрдЦ्рдпा рд╣ै।

рдЕрддः an=a5=a+4d

=2+4×8 

=2+32 

=34 

Class math exercise 5.3 Q.3(ii) in hindi⇒click here 

Class math exercise 5.3 Q.3(iii) in hindi⇒click here 

Class math exercise 5.3 Q.3(iv) in hindi⇒click here  

Class math exercise 5.3 Q.3(v) in hindi⇒click here

Class math exercise 5.3 Q.3(vii) in hindi⇒click here 

Class math exercise 5.3 Q.3(viii) in hindi⇒click here 

 class 10th math exercise 5.3 question 3(ix) in hindi- click here 

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