Question

plzzzz solve it... ​

Answer 1

Answer :-

$\large{\star\:\:\boxed{\bf{a_{15}\:=\:91}}\:\:\star}$

Explanation :-

Given :–

7 , 13 , 19 ,... are in A.P.

where a = 7 and d = 6 .

To Find :–

a₁₅ (15th term of this A.P.)

Formula Applied :–

$\boxed{\star\:\:\bf{a_n\:=\:a\:+\:(n\:-\:1)d}\:\:\star}$

Solution :–

We have ,

a = 7

d = 6

n = 15 .

Putting these values in the Formula :

$\rightarrow\sf{a_n\:=\:a\:+\:(n\:-\:1)d}$

$\rightarrow\sf{a_{15}\:=\:7\:+\:(15\:-\:1)(6)}$

$\rightarrow\sf{a_{15}\:=\:7\:+\:(14\:\times\:6)}$

$\rightarrow\sf{a_{15}\:=\:7\:+\:84}$

$\rightarrow\boxed{\bf{a_{15}\:=\:91}}$

∴ 15th Term of this A.P. is 91 .

Answer 2

Answer

Solution :–

We have ,

a = 7

d = 6

n = 15 .

$\rightarrow\sf{a_n\:=\:a\:+\:(n\:-\:1)d}$

$\rightarrow\sf{a_{15}\:=\:7\:+\:(15\:-\:1)(6)}$

$\rightarrow\sf{a_{15}\:=\:7\:+\:(14\:\times\:6)}$

$\rightarrow\sf{a_{15}\:=\:7\:+\:84}$

$\rightarrow\boxed{\bf{a_{15}\:=\:91}}$

∴ 15th Term of this A.P. is 91 .