1.

The sum of first ten terms of ap 2.5.8.11. is​

Answer»

Answer :-

Sum of first 10 terms = 155

Step-by-step explanation :-

Given:

  • First term = a = 2
  • Common difference = d = 5 - 2 = 3
  • Number of terms = n = 2

To find:

Sum of first 10 terms = ?

Formula USED:

Sₙ = n/2 [2a + (n - 1)d]

Solution:

Substitute the given VALUES in the above formula.

Sₙ = 10/2 [(2 × 2) + (10 - 1)3]

↠ Sₙ = 5 [4 + 9(3)]

⇢ Sₙ = 5 [4 + 27]

➪ Sₙ = 5 (31)

➪ Sₙ = 155

∴ Sum of first 10 terms = 155



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