Question

!!~~I RAISED THE POINTS AND WILL GIVE BRAINLIEST ITS ALSO MULTIPLE CHOICE~~!!
which describes the type of sequence in 99, 89.9, 78.8, 68.7, . . . . . ?

a) neither geometric nor arithmetic
b) geometric
c) arithmetic
d) both arithmetic and geometric

(pLeAsE TelL mE wHY yOu PIcKeD YoUr AnSwER)

Answer 1

Answer:

a) Neither arithmetic nor Geometric

Explanation:

Since 99-89.9= 9.1, and 89.9 - 78.8 = 11.1, the sequence is not arithmetic.

Like wise 89.9/99=0.908 and  78.8/89.9 = 0.876 makes it not a geomtric sequence

Step-by-step explanation:

Answer 2

Answer: Option 'a' is correct.

Step-by-step explanation:

Since we have given that

99, 89.9, 78.8, 68.7, . . . . .

Here,

$a_1=99\\\\a_2=89.9\\\\a_3=78.8\\\\a_4=68.7$

But we can see that there is minor difference between the consecutive terms:

So, we will go for common difference whether it is same or not.

$a_2-a_1=89.9-99=-9.1\\\\a_3=a_2=78.8-89.9=-11.1\\\\a_4-a_5=68.7-78.8=-10.1$

Their difference are not common.

So, It is neither geometric nor arithmetic.

Hence, Option 'a' is correct.