Question

Find the missing term in the series: A15, B10, ______, D3.

• A. C6
• B. C7
• C. E3
• D. None of these

Hint:

Check letters and numbers separately; common number changes are arithmetic differences like \(-5,-4,-3\) or other steady patterns.

Answer 1

The Correct Option is A

Step 1: Observe the letter pattern.
A, B, __, D \Rightarrow letters increase by \(+1\) each step \(\Rightarrow\) the missing letter is \(C\).
Step 2: Observe the number pattern.
Numbers: \(15, 10, __, 3\). Differences: \(15 \to 10\) is \(-5\). To reach \(3\) finally, a natural step-down is \(-4\) then \(-3\):
\(10 - 4 = 6\), and \(6 - 3 = 3\) \(\Rightarrow\) consistent.
Step 3: Combine.
Missing term \(= C6\).
\(\boxed{C6}\)