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Find the sum of the first 25 odd numbers: 1 + 3 + 5 + ...

Class 10Sum of n Terms of an APAlgebra — Sequences

A625
B525
C650
D576

Step-by-Step Solution

Sum of first

n

odd numbers =

n^{2} = 2 5^{2} = 625

. Check:

a = 1, d = 2, S = \frac{25}{2}

[2 + 24(2)] =

\frac{25}{2} (50) = 625

.

Answer: A) 625

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