Synopsis IAS

Answer

Solution

UPSC Prelims

Mathematics

Theme:

Sequences and Series / श्रेणी और अनुक्रम

Q50 2021, Sequences and Series

What is the value of 'X' in the sequence 2, 7, 22, 67, 202, X, 1822?

अनुक्रम 2, 7, 22, 67, 202, X, 1822 में 'X' का मान क्या है ?

Explanation

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The pattern being followed here is given below:

2 × 3 + 1 = 7;

7 × 3 + 1 = 22;

22 × 3 + 1 = 67;

67 × 3 + 1 = 202;

202 × 3 + 1 = 607;

607 × 3 + 1 = 1822.

Hence, our answer is 607.

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Q 50. 2021, Sequences and Series

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