alleryMiddle term of the AP 1, 5, 9, ..., 49 is
A29
B21
C25
D33
Answer & Solution
Correct answer: C. 25
1. Number of terms n = (49 - 1)/4 + 1 = 13.
2. Middle term is the 7th term.
3. a_7 = 1 + 6 * 4 = 25.
4. So the middle term is 25.
_Source: Selina Concise Mathematics Class 10, Ch on Arithmetic Progression (Mistral OCR'd PDF), section on middle term_
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