Question

If the sum of 11 consecutive odd numbers is 253 find the first term

Answer 1

Answer:

Let the first term be a

Common difference is 2

Number of terms is 11

Sum is 253

Sum = 11.

Odd number = 253.

First term = 253 / 11

= 23 is the answer.

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Answer 2

Answer:

Step-by-step explanation:

Let the no. be x,x+2,x+4....

n/2[2a+(n-1)d]=253

11/2[2x+10*2]=253

11/2(2x+20)=253

11x+110=253

11x=253-110

X=143/11

X=13 ; using the method of ap.