Question

What is the sum of the first 60 odd numbers

Answer 1

EVALUTION★

first 60 odd number

$1 \: 3 \: 5 \: 7 \: 9 \: 11 \: \: - - - - a_{60}$

we know that

$= > \: s_{n} = \frac{n}{2} (2a + (n - 1)d)$

• where

• $= > s_{n} = sum \: of \: total \: terms$

• a first term

• d =terms difference

• to a=1

• d=2

$s_{60} = \frac{60}{2} (2 \times 1 + (60 - 1)2) \\ \\ = 30(2 +59 \times 2 \\ \\ = 30(2 + 118) \\ \\ = 30 \times 120 \\ \\ = 3600$

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sum of the first 60 odd numbers★

=3600 ✅

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I hope it helps you