Question

If an A.P is -19, -15, -11, ........ 57. Find its middle terms.

Answer 1

Answer:

a10 = 17 and a11 = 21

Step-by-step explanation:

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Answer 2

an = a1 + (n-1)d

a1 = (-19)

d= -19 - (-11) = -8

n= ?

• n = ( 1 - a1/d) + 1
• (1 - (-19)/-8) -1)
• n=5

an = -19 + (5-1)-8

an = -23

Hence, the middle term is -23.

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