CBSE Class 10 Answered
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 | 19 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 | 20 Nov, 2012, 09:45: AM
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