Question

For an A.P. a = 2 and d = 7 then S4
=​

Answer 1

Answer:

S4=29

Step-by-step explanation:

S4=4/2[2*2+(4-1)7]

S4=2[4+(3)7]

S4=8+21

S4=29

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Answer 2

a=2

d=7

n=4

S4= 4÷2(2×2+(4-1)×7)

S4=2×(4+3×7)

S4=2×(4+21)

S4=2×25

S4=50