Question

If the first term of an AP is - 8 and the common difference is 4 then the sum of first 10 term is 


a. 92

b. 96

c. 100

d. 104

​

Answer 1

Answer:

100(C)

Step-by-step explanation:

GIVEN:

A= -8

D= 4

n= 10

Sn=?

We KNOW THAT:

Sum of n terms of AP = n/2[2a + (n – 1)d]

ie,

Sn  = n/2[2a + (n – 1)d]

SUBSTITUTE THE GIVEN FORMULAS:

Sn= 10/2[2(-8)+(10-1)4]

   =  5(-16+36)

   = 5(20)

   =100

the correct option is 'C'

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