Question

Find the 19th term of an A.P. -11,-15,-19.....

Answer 1

Answer:

a=-11

d=-15-(-11)=-4

n=19

so term =a+(n-1)d

= -11+(19-1)(-4)

= -11-72

= -83

Step-by-step explanation:

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Answer 2

Answer:

The given A.P. is - 11, - 15, - 19, ....

First term t1 = - 11,second term t2 = - 15

Common Difference = t2 - t1 = - 15 - (- 11)

= - 15 + 11 = - 4

General term tn = a + (n - 1) d

tn = - 11 + (n - 1) (- 4)

tn = - 11 - 4n + 4 = - 7 - 4n

t19 = - 7 - 4 × 19

= - 7 - 76 = - 83

∴ 19th term is - 83.

Step-by-step explanation:

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