Question

Find the number of terms in the A.P. 18, 15 1/2 ,13,...,-37

Answer 1

Answer:

5n=105, n=21

Step-by-step explanation:

18, 15 1/2 ,13,...,-37

18,15.5, 13,................-37

Here a=18 d=15.5-18=-2.5

We know that An=a+(n-1)d

so -37=18+(n-1)(-2.5)

Multiplying by -2

74=-36+(n+1)5

110=5n+5

5n=105, n=21

Answer 2

Answer:

N = 21

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