Question

ɪɴ ᴀᴩ 12ᴛʜ ᴛᴇʀᴍ ɪꜱ -13 ᴀɴᴅ ᴛʜᴇ ꜱᴜᴍ ᴏꜰ ꜰʀɪꜱᴛ ꜰᴏᴜʀ ᴛᴇʀᴍꜱ ɪꜱ 24 ꜰɪɴᴅ ᴛʜᴇ ꜰʀɪꜱᴛ 10 ᴛᴇʀᴍ​

Answer 1

Answer:

-13 = a + 11d (I)

24 = 4a + 6d (ii)

multiply 4 in (I)

-52 = 4a + 44d (iii)

(I) - (iii)

76 = -38d

d = -2

a = 9

A.P

9,7,5,3,1,-1,-3,-5,-7,-9

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