Question

The 10 th term of an AP is 25 and its 25th term is 10.What is common difference

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Answer 1

Answer:

given arithmetic progression is 7,13,19,25,... Here the first term is 7 and the common difference is 6. Thus using the formula t

n

=a+(n−1)d to find the 10

th

and the 25

th

terms, we get,

t

10

=7+(10−1)6

t

10

=7+54

t

10

=61

t

25

=7+(25−1)6

t

25

=7+144

t

25

=151

Solving the equations 1 and 2, we get

t

10

=61andt

25

=151

Thus, the 10

th

and the 25

th

term of the arithmetic progression 7,13,19,25,... are 61 and 151 respectively.

Answer 2

i thought its 1 .

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