Exams › SSC CGL (Prelims) › General

A student was asked to find the sum of the first 15 odd numbers. His answer was 225. Is it correct?

1. Yes
2. No
3. Can't say
4. None

Correct answer: Yes

Solution

The sum of the first n odd numbers is always $n^2$. For n = 15, the sum is $15^2 = 225$, so the answer is correct.

Related SSC CGL (Prelims) General questions

• What is the value of \(5 + 55 + 555 + 5555 + 55555\)?
• Simplify: \((214 + 3.8) - 215\)
• If $x = \sqrt{6} - \sqrt{2}$ and $y = \sqrt{5} - \sqrt{3}$, then which of the following is true?
• Evaluate: $\left(15 \div 13\right) \div \left(\frac{1}{10} + 1 - \frac{8}{10}\right)$
• Which of the following equals 20?
• A runner has to cover a distance of 100 km. After running for 5 hours 20 minutes, he finds that he has completed \(\tfrac{2}{3}\) of the total distance. What is his speed in km/h?

⚔️ Practice SSC CGL (Prelims) General free + battle 1v1 →