Question
In an arithmetic progression (AP), the first term is 7,
the common difference is 4, and the last term is 55. How many terms are there in the AP?Solution
ATQ, General term: aβ = a + (n β 1)d Given a = 7, d = 4, aβ = 55 So, 55 = 7 + (n β 1) Γ 4 55 β 7 = 4(n β 1) 48 = 4(n β 1) n β 1 = 12 n = 13
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