Question

In the ap the first term is 25 ntherm is-17 ans sum of n terms is 60 find common difference

Answer 1

Answer:

common difference is ( - 3 )

Step-by-step explanation:

a = t1 = 25

tn= - 17

Sn = 60

Sn = n ( t1 + tn )

2

60 = n ( 25 - 17 )

2

120 = n × 8

n= 120

8

n = 15

tn = a + ( n - 1 ) d

-17 = 25 + ( 15 - 1 ) d

- 17 - 25 = 14d

14d = - 42

d = - 3

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