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CBSE Class 10 Answered

Sum of n terms of an AP is 3n square + 5n.Find the AP and hence find its 15th term.
Asked by agraharianiruddha | 11 Jan, 2019, 18:49: PM
answered-by-expert Expert Answer
 
begin mathsize 18px style straight S subscript straight n equals 3 straight n squared plus 5 straight n straight a equals straight S subscript 1 equals 3 plus 5 equals 8 2 straight a plus straight d equals straight S subscript 2 equals 3 open parentheses 2 close parentheses squared plus 5 cross times 2 equals 22 straight d equals 6 subscript bold a subscript bold 15 bold equals bold a bold plus bold 14 bold d bold equals bold 8 bold plus bold 14 bold cross times bold 6 bold equals bold 92 end subscript end style
Answered by Arun | 14 Jan, 2019, 11:13: AM

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CBSE 10 - Maths
The number of terms in the AP 3,6,9,12 ....,111
Asked by sahooashutosh781 | 21 May, 2024, 13:26: PM
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CBSE 10 - Maths
1.The mean weight of 9 students is 25 Kg. if one more student is joined in the group, the mean is unaltered. Find the weight of 10th student 2.If the nth term of an A.P is pn+q find its common difference.
Asked by purbashadebnath1980 | 09 Mar, 2024, 12:10: PM
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CBSE 10 - Maths
which term of the AP 3,8,13,18.....is. 78?
Asked by durgauikey7000 | 08 Dec, 2023, 20:16: PM
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CBSE 10 - Maths
if m times the m th term of an AP is equal to n times the n th term, show that the (m+n) th term of the AP is zero
Asked by prassanna.j | 13 Nov, 2023, 23:23: PM
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CBSE 10 - Maths
The mth term of an AP is n and the nth term is m. Find the rth term of the AP.
Asked by latayadav23 | 17 Oct, 2023, 20:25: PM
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CBSE 10 - Maths
The 11th term from the end of the AP 10, 7, 4,........, -62 is  A) 25 B) 16 C) -32 D) 0
Asked by paresh0311 | 21 Mar, 2023, 16:58: PM
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CBSE 10 - Maths
n/2 [2+2n]
Asked by vaishaliboriwarruturushi | 16 Dec, 2022, 19:13: PM
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CBSE 10 - Maths
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Asked by jaiprakashprasadr | 19 Jul, 2022, 21:22: PM
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CBSE 10 - Maths
an-ak for the AP a,a+d,a+2d
Asked by harinimathi815 | 21 Feb, 2022, 20:14: PM
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CBSE 10 - Maths
plzz solve all these
question image
Asked by monalipradhan909 | 21 Mar, 2021, 19:10: PM
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