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Find the sum 24+25+....+100

A) 4774
B) 4674
C) 4764
D) 4467

Correct Answer:

A) 4774

Description for Correct answer:
\( \Large \sum_{n=1}^{100} n = \frac{100 \left(100+1\right) }{2} = \frac{100 \times 101}{2} = 50 \times 101 = 5050 \)

\( \Large \sum_{n=1}^{23} \frac{23 \times 24}{2}=23 \times 12 = 276 \)

Therefore, 24+25+....+100 = 5050-276=4774

Part of solved Factorisation questions and answers : >> Elementary Mathematics >> Factorisation

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