Question

sum of the first 4terms 72 and sum of first 9 term is also 72.what is the 5 th term? find the sum of first 5 terms? write the sequence ?​

Answer 1

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Step-by-step explanation:    let a be the first term and d be the c.d of A.P

S4=4/2(2a+3d)

72 =4a+6d

36=2a+3d. (1)

S9=9/2(2a+8d)

72*2=18a+72d

4*2=a+4d

8=a+4d. (2)

from (1)and (2)

d=-4 and a=36

Answer 2

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A.P

S4 = 4/2 (2a+3d)

72 = 4a+6d

36 = 2a+3d (1)

S9 = 9/2 (2a+8d)

72*2 = 18a+72d

4*2 = a+4d

8 = a+4d (2)

from (1) and (2)

d=-4 and a = 36

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