1.

two ap have the same common difference . the first of one of these is -1 and that of the other is -8 .then the difference between their 4th terms is :​

Answer»

Answer:

7

Step-by-step explanation:

In APs, nth terms is GIVEN by a + (N - 1)d, where a is FIRST term and d is common difference.

As the com. dif. is same, let that be 'd'.

For AP with -1: 4th term is

= > - 1 + (4 - 1)d

= > - 1 + 3d

For AP with - 8: 4th term is

= > - 8 + (4 - 1)d

= > - 8 + 3d

Difference in their 4th term is:

= > (- 1 + 3d) - (- 8 + 3d)

= > - 1 + 3d + 8 - 3d

= > 8 - 1

= > 7


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