What is the sum of the first 10 odd numbers?
A100
B110
C120
D130
Answer & Solution
Correct answer: A. 100
1. The sum of the first n odd numbers is n times n.
2. Here n is 10.
3. So the sum is 10 times 10, which is 100.
_Source: NCERT Class 5 Mathematics, 'Math-Magic', Ch 7 'Can You See the Pattern?'_
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