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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:
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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