Question

please someone give me the solution of 27th one..​

Answer 1

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Answer 2

HERE IS YOUR ANSWER. ...

a = -12

d = -9-(-12)

d = -9 +12

d = 3

an = 21

an = a + (n-1) d

21 = -12 + (n-1 ) 3

33 = (n-1) 3

n-1 = 11

n =12

New ,

a= -12+1

a = -11

d = -8 +11

d = 3

an = 21 +1

an = 22

sn = n/2 ( 2a + (n-1 )d )

sn = 12/2 (-22 + 33 )

sn = 6 (11)

sn = 66 . Ans .....

Thus AP is ..... -11 , -8 , -5 .......... 22

HOPE IT HELPS YOU! ....

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