Question

the 12th term of an ap is 70 more than its second term and the common difference of the ap is dash​

Answer 1

Step-by-step explanation:

in AP nth term = a + (n-1)d

where a = first term

n = no. of term

d = common difference

according to question,

a + 11d - (a + d ) = 70

a +11d - a - d = 70

10d = 70

d = 7

Answer 2

Answer:

common difference is 7

and ap is -7, 0, 7, 14.. . . .,

Step-by-step explanation:

we need to find d, A. P.???

for finding the common difference we can take

(a1=a+d)..........eq..1

a12=a+11d

70=a+11d

70-11d=a (eq...2)

substituting equation (2) in equation (1)

70-11d+d=a1

70-10d=0

• 70=10d

70/10=d

7=d

now a=70- 11d

a=70-11(7)

a=70-77

a=-7

now for A.P.

a2=a+d

a2=-7+7

a2=0

a3=a2+d

a3=0+7

a3=7

hence A.P.=-7, 0, 7.....,