Question

If the and term of AP is 3N +5
find the sum of first 12 times

Answer 1

Hi ...dear...

....here is your answer!!!!.......

......Given that Tn= 3N +5..

.... putting n= 1,2,3,4........we get....
....T1= 8
T2= 11
T3= 14....
..
.....
..
..T6 = 3*6+ 5
T6 = 18+5= 23
..sum of 6th term will be 6/2{ T1+ T6}
.......= 3*(23+8)
= 3* 31
= 93 ..... .
hope it helped you!!
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