Math, asked by DevPotadar, 10 months ago

In an a.p 2+7+12...find the sum of first 20 terms

Answers

Answered by Anonymous
44

Refer to the attachment!!

Attachments:
Answered by anusha3579
0

Step-by-step explanation:

Hey mate this is your answer

difference = 5

a = 2

n = 20

An = a + ( n - 1 ) × d

an = 2 + ( 20 - 1 ) × 5

an = 2 + ( 19 ) × 5

an = 2 + 95

an = 97

sn = n / 2 × ( a + an )

sn = 20 / 2 × ( 2 + 97 )

sn = 10 × ( 99 )

sn = 990

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