Arithmetic Progression (समांतर श्रेणी) : Sum Of an A.P. 🔥 के सभी सवाल IN ONE VIDEO by Aditya Ranjan

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The sum of first 2n terms of 2,5,8,... is
=2n2[2(2)+(2n−1)(3)]
=n(6n+1)
The sum of n terms of 57,59,61,... is
=n2[2(57)+(n−1)(2)]
=n(56+n)
Given that n(6n+1)=n(56+n)
Whuch means
6n+1=56+n
5n=55
n=11

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Question 25 ka answer -d(86350)

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Option D

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Q.30 -(C)11

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Q. 25:- (d) 86350

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25) 86350
30) 11
Thank you Guruji ❤

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Kaise kiya 30 ka plz explain

[@Excise-Inspector-Subhajit]

​@@letslearnmathsin4074 for 2n terms,
last term (l) = a+(2n-1)d = 2+(2n-1)×3 = (6n-1)
For n terms,
last term (l) = a+(n-1)d = 57+(n-1)×2 = (2n+55)
now the sum is equal so,
2n/2 [ a+l ] = n/2 [ a+l ]
=> 2n/2 [ 2+6n-1] = n/2 [ 57+2n+55 ]
Therefore, n = 11 (ans)
Do the calculation.

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Q. No. 25 ka answer 86350 hoga

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25 d 86350 ans ❤❤

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5:09

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Question number 27 me Positive integer ki baat hui hai to 3 ko kaise likh sakte hai jabki 0 positive integer me count nhi hote... To frst term 3 nhi likh sakte..
Ans 13 hoga. series 10 se strt kro.

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Last question Ans--=8

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Ans. Of Q. (25) :- 86350

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25-d
30-c

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86350,Q-30=11 ans 🙏🙏

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25(d)

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C. 11

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25 __86350😊
ESME PHLE 2ND PAD NIKAL KR DIRECT L =a ➕ (n-1)d (Antim pad ) NIKAL LIYE HAI FIR FORMULA PR RAKH KE Sn=n/2(a ➕ l)
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HW: Q 25: 83650
Q 30: 11

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H.W : 1) 86350
2)11

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D,
86350 ans

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4:30❤

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25-d answer

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Hum

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Q.25. 86350

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30) 11 ans

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Q 25 ans 86350 d

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I am class 10 🔟 all solv

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Q.25=86350
Q.29=11

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D

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Ans of last question is 11

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30 n 11

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25 d

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30-c, ans-11

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Sir g 25 q -d 86350 is the answer

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24:50

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28:12

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25. - 86350
30. - 11

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Ans 86350

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86350 hoga ans

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n=11

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Q25. D.86350

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Q30. C. 11

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D ans h

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30 ka c
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11

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1127

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25- 86350

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86350

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25 86350

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6:51

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25 d

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D

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Teek hai

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