Question

ɪғ ᴛʜᴇ 3ʀᴅ ᴀɴᴅ ᴛʜᴇ 9ᴛʜ ᴛᴇʀᴍs ᴏғ ᴀɴ ᴀ.ᴘ. ᴀʀᴇ 4 ᴀɴᴅ − 8 ʀᴇsᴘᴇᴄᴛɪᴠᴇʟʏ, ᴛʜᴇɴ ᴡʜɪᴄʜ ᴛᴇʀᴍ ᴏғ ᴛʜɪs ᴀ.ᴘ ɪs ᴢᴇʀᴏ. to?​

Answer 1

Answer:

Step-by-step explanation:By the conditions,

a+2d=4..(1)

a+8d=-8..(2)

If we do (2)-(1), we get

8d-2d=-8-4

6d=-12

d=-2

Putting this in (1), we get

a+2(-2)=4

a-4=4

a=8

According to the given,

a+(n-1)d=0

8+(n-1)(-2)=0

-2(n-1)=-8

n-1=4

n=5

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