Question

An A.P consists of 31 terms.if it's 16th term is m,then the sum of all the terms of this A.P is___?​

Answer 1

Step-by-step explanation:

16th term = a+15d = m

sum = 31/2[2a+30d] = 31[a+15d] = 31m

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Answer 2

Answer:

Bhai tera question incomplete hain

Step-by-step explanation:

Given:

n = 31

a+15d= m

a16 = m

Method:

Sn = n/2 [ 2a + (n - 1)× d ]

Sn = 31/2 [ 2a + (31-1)×d ]

Sn = 31/2 [ 2a + 30 × d ]