Question

common difference of a number is 7 and 9th term is 63. What is the 15 th term. Which term is 175

Answer 1

here, d=7 t9=63
when t9=63
a+(n-1)d=63
a+56=63
a=63-56
a=7

then t15=a+(n-1)d
=7+(15-1)7
=7+98
=105
now,
a+(n-1)d=175
7+(n-1)7=175
(n-1)7=175-7
n-1= 24
n=24+1
n=25

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