Question
Mon November 12, 2012 By:

If the 10th term of an A.P is 47 and it's first term is 2 , find the number of it's 15 term

Expert Reply
Tue November 13, 2012
Answer : Given : t10 = 47 and a = 2
To find : t15
As we know,
tn = a + (n-1)d
 
when n=10
t10 = 47 = 2 + (10-1)d = 2+ 9d
=> d = 5
now , using the above value and applying same formulae as above, we get
t15 = 2+ (15-1) 5 = 2+70 = 72 Answer
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