Question

which term of an AP 5,2,-1....is-49​

Answer 1

Answer:

let a be 1st term and c.d be common diff. and let n be required term

here a=5 and c.d=-3

Tn=a +(n-1)d

here Tn is given-49

-49=a+(n-1)d

-49=5+(n-1)-3

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-57=-3n

n=19

Answer 2

Answer:

given AP=

5,2,-1,........-49

here,

a( first term) =5

d( common difference)=-3

let nth term of an ap be 49

since,. an=a+(n-1)d

= 49=5+(n-1)×(-3)

=. 49-5=(n-1)×(-3)

=. 44/-3=n-1

=. - 44/3 +1=n

=. n=-41/39