Find the next term of the following number series :
5, 10, 26, 50, 122, ?निम्न संख्या श्रेणी का अगला पद ज्ञात कीजिए :
5, 10, 26, 50, 122, ?

1. A154
2. B162
3. C170
4. D178

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Correct answer: C. 170

Explanation

The terms are (prime)² + 1: 2² + 1 = 5, 3² + 1 = 10, 5² + 1 = 26, 7² + 1 = 50, 11² + 1 = 122. The next prime is 13, so the next term is 13² + 1 = 170.श्रेणी के पद (अभाज्य संख्या)² + 1 हैं: 2² + 1 = 5, 3² + 1 = 10, 5² + 1 = 26, 7² + 1 = 50, 11² + 1 = 122। अगली अभाज्य संख्या 13 है, अतः अगला पद 13² + 1 = 170 है।