in an AP the fifth term is 1 by 12 and the 11th term is 1 by 15 then find the 25th term
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Step-by-step explanation:
a+4d = 1/12 a+10d = 1/15
12(a+4d) = 1 15a + 150d = 1 -----(2)
12a + 48d = 1 -----(1)
from equation (2) - (1)
3a + 102d = 0
a + 34d = 0
a = -34d
-30d = 1/12
d = -1/360 , a = 34/360 = 17/180
A(25) = a+24d = 17/180 -24/360 = 10/360 = 1/36
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