Question

9. The sum of first 16 terms of the AP: 10, 6, 2,... is

Answer 1

Answer:

Here is your answer

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Answer 2

Answer:

Sum Of First 16 Terms = -320

Step-by-step explanation:

Sum of first n terms of an AP is denoted by the equation

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

here,

Sn = sum of n terms

n = number of terms

a = first term

d = common difference

Here,

n = 16

a = 10

d = -4

Therefore,

Sn = (16/2)((2×10)+(16-1)(-4))

Sn = 8(20+(15×(-4)))

Sn = 8(20-60)

Sn = 8×(-40)

Sn = -320

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