Question

which term of the A.P 2,-1,-4,-7,....is -40?
a)8th b)15th c)11th d)23rd​

Answer 1

Answer:

d= -1-2

d=-3

then

an=-40

a = 2

now

-40=2+(n-1)(-3)

-42=(n-1)(-3)

-42/-3=n-1

14=n-1

n=15

so b is correct

Answer 2

Answer:

an = a + (n-1)d

-40= 2 +(n-1) -3

-40-2= (n-1) -3

-42/-3 = n-1

14 = n-1

14+1 = n

15 =n

So answer is 15th term

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