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CBSE Class 10 Answered

in an AP of 50terms the sum of first 10 term is 210 and sum of last 15 term is 2565 find AP  
Asked by dhruvshrotriya03 | 23 Feb, 2019, 03:53: PM
answered-by-expert Expert Answer
According to the question,
S10 = 210
a + a + d + a + 2d + .....+ a + 9d = 210
10a + d(1 + 2 + ...+9) = 210
10a + 45d = 210
2a + 9d = 42 ....(i)
Similarly you can solve it for
S15 = 2565
we get a + 42d = 171 ....(ii)
Solving (i) and (ii) we get 
a = 3 and d = 4
Find A. P. which is 3, 7, 11,....
Answered by Sneha shidid | 23 Feb, 2019, 07:58: PM

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