Math, asked by priyanshu200326, 1 year ago

the 1st and last term of an AP is 4 and 81 respectively. if the common difference is 7 fund no of terms are in AP and their sum

Answers

Answered by venkatramanan41223

2

Answer:12

See the image given below

Attachments:

mayankrawal2003: Sn = n/2(a+an)

mayankrawal2003: Sn=12/6(4+81)

mayankrawal2003: Sn= 6 (85)

mayankrawal2003: Sn= 510

Answered by 12harshitab

2

Answer:

Step-by-step explanation:

Attachments:

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