If the 10th tearm of an AP is 47 and it's first term is 2,find the number of it's 15 term ?

Asked by  | 19th Nov, 2012, 10:07: PM

Expert Answer:

10th term of an APis given by; a+9d = 47

and first term is given as a = 2

now put the value of a in 1st eqn., we get , d= 5

so sum of first 15 terms is given by; S = 15/ 2 [ 2(2) + 14 (5) ] = 480

Answered by  | 20th Nov, 2012, 09:45: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.