Question

the 10th term and 4th term of an AP are 125 and 0.find the sum of first 35 terms??​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Step-by-step explanation:

Given The 10th term and 4th term of an AP are 125 and 0.find the sum of first 35 terms??

• Given 10 th term is 125
• 4 th term is 0
• So we get the equations as  
• a + 9d = 125 ----------------1
• a + 3d = 0 -------------------2
• subtracting the equations we get
•  6d = 125
• Or d = 125/6
• Substituting d in equation 2 we get
• So a + 3 (125/6) = 0
• Or a = - 125 / 2
• Now we know that sum to n terms is given by
• Sn = n/2 [2a + (n – 1)d]
•     = 35/2 [2 (-125/2 + (35 – 1) 125/6]
•    = 35/2 [- 125 + 708.33]
•  = 35/2 x 583.3
• = 10,208.33

So S35 = 10,208.33

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https://brainly.in/question/9782459

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