Question

if the first term of an ap is 5 and the sixth term is 30 then find sum of first six terms​

Answer 1

Answer:

a=5

a6 = 30 therefore a+5d=30 => 5+5d=30 => d=5

S6 = ?

Formula : Sn = n/2(2a+(n-1) d)

S6= 6/2 (10+(5)5)

=> 3(35) => 105

Your answer will be 105...