Question

The 13 term of an AP is thrice its 3rd term. If its 6* term is 8, then find the sum of its first 30 terms.

please answer​

Answer 1

Step-by-step explanation:

1) a13=3a3

a+(n-1) d=3(a+(n-1) d)

a+nd-d=3a+3nd-3d

2a-2nd-2d=0

a-nd-d=0...... (1)

a6=8

a+(n-1) d=8

a+nd-d=8....(2)

solve 1.2

and get a and d

after

s30=n/2(2a+(n-1) d)

put value here

mark as brilliant

Answer 2

Answer:

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