Find the missing number in the series: 5, 7.5, 12.5, 22.5, ?
Correct answer: A. 42.5
- A. 42.5
- B. 42
- C. 44
- D. 43.5
Explanation
The pattern is to multiply the previous number by 2 and then subtract 2.5. For example, 7.5 = (5 × 2) - 2.5 and 12.5 = (7.5 × 2) - 2.5. The missing term is (22.5 × 2) - 2.5 = 45 - 2.5 = 42.5.
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Specific defense mechanisms protect the body through antigen recognition by B and T lymphocytes. The topic covers clonal selection, antibody production, plasma and memory cells, cell-mediated responses, helper and cytotoxic T cells, and the difference between primary and secondary immune responses.
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