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Question

If you have a finite arithmetic sequence, the first number is 2 and the common difference is 4, what is the 5th number in the sequence?

A
6
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B
10
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C
14
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D
18
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Solution

The correct option is D 18
A sequence of the type a,a+d,a+2d,a+3d is said to form an finite A.P.
Where a= first number =2
d= common difference =4
Then the general form of finite A.P. =2,6,10,14,18
So, 18 is the fifth number in the finite arithmetic sequence.

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