Question

Which term of AP 7+4+1+………. Is -56​

Answer 1

Answer:

a = 7

d = a2- a1 = 4 - 7 = -3

an = -56

-56 = a + (n-1)d

-56 = 7 + (n-1)-3

-56-7 = -3(n-1)

-63 = -3(n-1)

-63/-3 = n-1

21 = n-1

n = 21+1

n = 22

Hence, 22nd term of the given A.P. is -56