Maths · Arithmetic and Geometric progressions
The term of an A.P. is -40 and term is zero, then is equal to :
The \( 3^{r d} \) term of an A.P. is -40 and \( 13^{t h} \) term is zero, then \( d \) is equal to :
- A. -4
- B. 4
- C. 0
- D. -
Step-by-step solution
Given a3 = a + 2d = -40 and a13 = a + 12d = 0. Subtracting gives 10d = 40, so d = 4.
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