Question

find nth term of AP: 11,9,7,5​

Answer 1

Step-by-step explanation:

Given

• a1 = 11
• a2= 9
• a3 = 7
• a4 = 5

Now, nth term or an = a+(n-1)d

=> d = a2-a1, a4-a3

=> d = 9-11 , 5-7 = -2

So, an = a+(n-1)d

Therefore, an = 11+(n-1)-2 [ a1 = a]

=> an = 11-2n +2

=> an = 13-2n

So, nth therm of this AP is 13-2n

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