1.

Find the 12th term of given a.p -1,-4,-7 also find s10​

Answer»

Answer:

a = -1 ,d = -4+1= -3

n = 12

a12 = -1+(12-1)(-3)

-1+11(-3)

-1-33 = -34

S10 = 10/2 (-2+(10-1)(-3))

5(-2-27)

5×(-29)

-145



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