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Home/ Questions/Q 202987
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amitpaswan09
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amitpaswan09
Asked: January 23, 20232023-01-23T10:59:10+00:00 2023-01-23T10:59:10+00:00In: Class 10 Maths

Find the 31st term of an AP whose 11th term is 38 and the 16th term is 73.

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Find the common difference (d) by subtracting the 11th term from the 16th term and dividing by the number of terms between them.
Which formula use to find the 31st term of the AP.
How it is expresses the nth term an in terms of the first term a1 and the common difference.
Class 10th Maths, Important Arithmetic Progression Solutions.

class 10mathsncert
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      shaanu01
      2023-01-25T07:18:17+00:00Added an answer on January 25, 2023 at 7:18 am

      Here, a₁₁ = 38 and a₁₆ = 73. To find: a₃₁
      Given that: a₁₁ = a + (11 – 1)d = 38
      ⇒ a + 10d = 38
      ⇒ a = 38 – 10d ….(1)
      and a₁₆ = 73 ⇒ a + 15d = 73
      Putting the value of a from equation (1), we get
      38 – 10d + 15d = 73
      ⇒ 5d = 35 ⇒ d = 7
      Putting the value of d in equation (1), we get
      a = 38 – 10(7) = – 32
      Therefore, a₃₁ = a + 30d = – 32 + 30(7) = 178
      Hence, the 31st term is 178.

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