In an A.P. T3 = 25 and T10 = - 3 then T12 is
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Step-by-step explanation:
T3 means 3rd term so
a+2d=25 ................ (1)
a + 9d = - 3 ............. (2)
Subtracting (2) from (1)
- 7d = 28
d = - 4
Put in equation (1)
a + 2( - 4) = 25
a - 8 =25
a = 25 + 8 = 33
So 12th term will be
a + 11 d
Put the value of a and d. In it
= 33 + 11 ( - 4)
= 33 - 44
= - 11
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