alleryWhat is the sum of the first 5 odd numbers?
A15
B35
C45
D25
Answer & Solution
Correct answer: D. 25
1. The first five odd numbers are 1, 3, 5, 7 and 9.
2. The sum of the first n odd numbers is n times n, and here n is 5.
3. So the sum is 5 times 5, which is 25.
_Source: syllabus Mathematics, 'Math-Magic', Ch 7 'Can You See the Pattern?'_
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