Question

_5,-5/2,0,5/2 find 20th terms

Answer 1

Answer:

85/2

Step-by-step explanation:

a= first term = -5

d = comman difference = 5/2

hence 20 term = a+ 19d

-5 + 47.5

= 85/2

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Answer 2

Given :

• A.P. = - 5 , - 5/2 , 0 , 5/2

• First term ( a ) = - 5

• Common difference ( d ) = -5/2 - 5 = 2.5

To Find :

• 20th term pf given AP

Solution :

$\Large \boxed{ \boxed{ \sf A_n =a + (n - 1)d }}$

$\implies \sf A_{20} = - 5 + (20 - 1)2.5 \\ \\\implies \sf A_{20} = - 5 + 19 \times 2.5 \\ \\\implies \sf A_{20} = - 5 + 47.5 \\ \\\implies \sf A_{20} =42.5 \\ \\ \implies\large \boxed{ \boxed{ \sf A_{20} = \frac{85}{2} }}$