The sum of the first 15 terms will be equal to 1515.
What is arithmetic progression?
The sequence in which every next number is the addition of the constant quantity in the series is termed the arithmetic progression
The sum of all the terms from a1 to an when you are summing up n terms is
S = n (a₁ + an ) / 2
find the 1st and 15th term
1st term is a₁= 10 ( 1 ) = 21 = 10 + 21 = 31
15th term is a₁₅ = 10 ( 15 ) + 21 = 150 + 21 = 171
and n = 15
= 15 ( 31 + 171 ) / 2
= 15 ( 202 ) / 2
= 3030/2
= 1515
Therefore the sum of the first 15 terms will be equal to 1515.
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