Question

Find S60, when tı = 7, tn = 243 a) 7500 b(7400 c) 750 d) 740​

Answer 1

Answer:

T

n

=5n−3

T

1

=5(1)−3=2

T

2

=5(2)−3=7

d=T

2

−T

1

=7−2=5

a=T

1

=2

S

20

=

2

20

[2a+19d]

=10(4+95)

=990.

Step-by-step explanation:

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Answer 2

Answer:

a) 7500 by s60 =60/2(7+243)=7500