Multiple choice

Write the next term in the series given below. 7, 21, 63, ___

  1. 169

  2. 159

  3. 189

  4. 109
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C Correct answer
Explanation

The series is a geometric progression with a common ratio of 3: 7 * 3 = 21, 21 * 3 = 63, 63 * 3 = 189.

AI explanation

The pattern uses the method of multiplication by a constant, where every term is multiplied by 3 to get the next term. The working is 7 * 3 = 21 and 21 * 3 = 63. Continuing this sequence, the next term is 63 * 3 = 189.

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