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In an AP, Of Sn=n(4n+1) , find the Ap

Posted by Rutuja Londhe 2 years, 3 months ago

2 answers

S P Jaishwal 2 years, 3 months ago

Sn = n(4n+1) Sn = 4n^2 +n Sn-1 = 4(n-1)^2 +(n-1) Sn-1 = 4(n^2+1-2n) +(n-1) Sn-1 = 4n^2+4-8n +n -1 Sn-1 = 4n^2-7n -3 Sn - Sn-1 = 4n^2+ n -(4n^2-7n-3) = 4n^2+n -4n^2+7n +3 =8n +3 =TN =8n +3 T1 = 8×1+3= 11 =a T2 =8×2 +3 = 19 d = T1-T2 =19 - 11= 8 =d AP = 11, 19, 27 ,.......

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Roma Jebisow 2 years, 3 months ago

1.1

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If the ratio of sum of first m and m terms of an AP is m^2:n^2, show that the ratio of its mth and nth terms is (2m-1):(2n-1)

Posted by Pranav Wersun 2 years, 3 months ago

CBSE > Class 10 > Mathematics

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6x²_2x+⅙

Posted by Raj Sen Pandey Rsp 2 years, 3 months ago

CBSE > Class 10 > Mathematics

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if x cos a = 8 and 15 coseca = 8 sec(a) then the value of x is

Posted by Satyam Yadav 2 years, 3 months ago

CBSE > Class 10 > Mathematics

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If 1 is the zero of the polynomial p(x) = x ^ 3 + a * x ^ 2 + 2b and a + b = 4 then (2) * a = 9, b = - 5 (4) a = 3, b = 1 (1) a = 5, b = - 1 (3) a = 7, b = - 3

Posted by Shreyansh Agarwal 2 years, 3 months ago

CBSE > Class 10 > Mathematics

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Two positive integer a and b can be written as a=x2 y2 and b=xy2 where n and y are prime numbers find LCM (a,b)

Posted by Manavala Akhila 2 years, 3 months ago

CBSE > Class 10 > Mathematics

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If X + 2 is a factor of the polynomial 2x² + 2ax + 5 x + 10 then find a

Posted by Priyanshi Singh 2 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Aditya Agarwal 2 years, 3 months ago

a =2

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By Euclid’s division lemma x = qy + r, x > y the value of q and r for x = 27 and y = 5 are:

Posted by Saurav Kumar Dwivedi 2 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Raghav And Madhav Maheshwari 2 years, 3 months ago

Hello

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a=x power y Power and b=xy2 where x,y

Posted by Ayati Gupta 2 years, 3 months ago

CBSE > Class 10 > Mathematics

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Sum of the areas of two squares is 468 m² If the difference of their perimeters is 24 m, find the sides of the two squares

Posted by Vasuki Kannankumar 2 years, 3 months ago

CBSE > Class 10 > Mathematics

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Find the sum:- 7+10½+14...+84

Posted by Mohit Gothwal 2 years, 3 months ago

CBSE > Class 10 > Mathematics

3 answers

Khwahis Parveen 2 years, 3 months ago

7+10½+14+........+84 Now first find the n By the formula, An=a+(n-1)×d Here, An =84 a=7 and d = 7/2 Put the value 84=7+(n-1)×7/2 84=7+7/2n-7/2 84=7/2+7/2n 84-7/2=7/2n 161/2=7/2n n=23 Sn=n/2(a+l) Sn=23/2(7+84) Sn=23/2×91 Sn=2093/2 Sn=1046.5 OR Sn=1046½

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Mohit Gothwal 2 years, 3 months ago

No... I can't find the answer by this shall we use n/2 (a+l)

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Saurav Kumar Dwivedi 2 years, 3 months ago

Apply the formula of Sn term = n/2(2a +(n-1)d) of arithmetic progression you will definitely get answer

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Prove that sec A (1-sin A)(sec A+ tan A) = 1

Posted by Mohit Gothwal 2 years, 3 months ago

CBSE > Class 10 > Mathematics