Question
Mon November 19, 2012 By:
 

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

Expert Reply
Tue November 20, 2012

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
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