Aspire Faculty ID #17638 · Topic: JAMIA MILLIA ISLAMIA MCA 2025 · Just now
JAMIA MILLIA ISLAMIA MCA 2025

If the 5th term of an arithmetic progression is 20 and the common difference is 3, what is the first term?

Solution

Formula of AP:
$a_n = a + (n-1)d$

Given:
$a_5 = 20,\ d = 3$

So,
$20 = a + (5-1) \cdot 3$
$20 = a + 12$
$a = 8$

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