Question

find the number of the terms in an AP,18,15,12 ....... -48 and also find the sum of all of its terms​

Answer 1

Answer:

hi

Step-by-step explanation:

ANSWER

Given,

a=18

d=

2

31

−18=−

2

5

Formula,

a

n

=a+(n−1)d

=18+(n−1)(−

2

5

)

a

n

=

2

41−5n

S

n

=

2

n

[2a+(n−1)d]

=

2

n

[2(18)+(n−1)(−

2

5

)]

=

2

n

[

2

41−5n

]

S

n

=

4

41n−5n

2

Answer 2

Answer:

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