Math, asked by ajpicks20, 11 months ago

hey mates,,,
can u solve it for me:


If for an AP the first term is 3 and the common difference is 6 then find Sn and hence find S10​

Answers

Answered by sowbarnika
3

Step-by-step explanation:

this is your answer.. 300 and 3n^2

Attachments:
Answered by kashvijrao
4

Step-by-step explanation:

a=3

d=6

Sn = n /2 [2a + (n-1)d]

= n/2 [2 x 3 + (n-1) 6]

= n/2 [6 + 6n - 6]

= n/2 [6n]

= n/2 x 6 (n)

= n x 3n

= 3n^2

S10 = n/2 [2a + (n-1)d]

= 10/2 [2 x 3 + (10-1)6]

= 5 [6 + 9x 6]

= 5 (6+54)

= 5 (60)

= 300

Hope this helps you buddy! Mark this as the brainlist answer!

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