Question

Find the sum of middle terms in A.p 20, 16, 12........(-176). Also check if 0 is a term of this ap if yes, find n

Answer 1

Answer:

first we find how much term

Tn =a + (n-1) d

-176 =20 + (n-1)(-4)

-196 =(-4)(n-1)

n=50 .

n is an even number so there are two middle terms exist here

e.g 25th and 26th

so,

25th term =20 + (25-1)(-4)=20-96 = -76

26th term =20 +(26-1)(-4)= -80

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Step-by-step explanation: