Math, asked by najiyatrkukku, 1 day ago

13. a) Find the sum of first 15 natural numbers.b) The sum of first 15 terms of an arithmetic sequence with common difference 6 is 780.Write the algebraic form of the sequence.c) What is the sum of the first n terms of the sequence?

Answers

Answered by malekaaliya22

1

Answer:

The number series 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 sum of number 120

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