Question

is -73 a term of the A.P: 5,2,-1......?
class 10​

Answer 1

Answer:

common diff. = -3

Therefore,

-49 = 5 + ( n - 1) * -3

-49 - 5 = ( n - 1 ) * -3

- 54 / - 3 = ( n - 1 )

18 = n - 1

n = 18 + 1

n = 19

19 th term is -49.

Step-by-step explanation:

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Answer 2

an = -73

A.P - 5,2,-1,........

a = 5

d = 2-5 = -3

an = a+(n-1)d

-73 = 5+(n-1)-3

-73= 5-3n+3

-73 = 8-3n

3n = 73+8

3n = 81

n = 29

29 is a natural number

So Yes, 73 is a term of the given A.P