Grade 10Trigonometry
in ap the 13th term is 22 and d is -1/2 then first term
in ap the 13th term is 22 and d is -1/2 then first term
1 Answer
Hari Charan reddy
we know that, nth term of an AP = a + (n-1)d
so, 13th term = a + (12)d
i.e. a + 12d = 22
a + 12(-1/2) = 22
a – 6 = 22
Therefore, a(first term) = 22 + 6 = 28.
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