Question

Find the 20th term of the Ap -3,-7,-11

Answer 1

here,.

a= -3

d= common difference= -4

we know,

the general formula for finding the nth term is:

tn= a+(n-1) ×d

t20= -3+(20-1) ×(-4)

t20=-3+(19) ×(-4)

t20= -3-76

t20= -79

therefore,

the 20th term= -79

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