15-05-2021
Mathematics

contestada

Find the sum of the 1st 112 terms of: 7 + 11 +15 + .....
25648
112
224
25846

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15-05-2021

Answer:

It is an Ap (Arithmetic Sequence)

d=4

a=7

n=112

Using the Formula

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

Sn= 112/2 [2(7) + (112-1)(4)]

Sn= 56[14 + (111)(4)]

Sn= 56[14 + 444]

Sn= 56(458)

Sn= 25,648.

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