If the sum of the first 40 terms of the series,

Question:

If the sum of the first 40 terms of the series, $3+4+8+9+13+14+18+19+\ldots$ is (102)m, then $\mathrm{m}$ is equal to :

  1. 20

  2. 5

  3. 10

  4. 25

Correct Option: 1

Solution:

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