Math, asked by hiransnair03, 8 months ago

FIND THE SUM
OF SEQUENCE
1,4,7.... 58 ​

Answers

Answered by deepika6320
0

Answer:

a=1

d=a2-a

=4-1

=3

an=58

Sn=n÷2(2a+(n-1)d

we have to find n value

an=a+(n-1)d

58=1+(n-1)3

58-1=(n-1)3

57÷3=n-1

19+1=n

n=20

Sn=n÷2(2a+(n-1)d)

Sn=20÷2(2(1)+(20-1)3

Sn=10(2+57)

Sn=10(59)

Sn=590

therefore Sn=590

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