Question

Find the sum of 10term of 5+8+11+.....;​

Answer 1

Answer:

a = 5

d = 8-5 = 3

an = ?

an = a+ ( n-1) d

      5 + ( n-1) 3

      = 5+ 3n-3

      = 3n = 6

       =  n = 2

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Step-by-step explanation:

Answer 2

Answer:

185.

Step-by-step explanation:

a = 5

d = 8 - 5 = 3

n = 10

Sn = ?

Sn = (n/2){2a + (n - 1)d}

Sn = (10/2){2(5) + (10 - 1)3}

Sn = 5 * {10 + 27}

Sn = 5 * 37

Sn = 185.

So the sum of the first 10 terms of this AP is 185.

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