what will be the 15th term of an AP Series -15,-10,-5,0,5,10,15 ________
Answers
Answered by
0
Answer: Given A.P is
10.0,10.5,11.0,11.5,.....
first term of this A.P is a
1
=10.0
second term of this A.P is a
2
=10.5
common difference of an A.P is given by
(i.e.,d=a
n+1
−a
n
)
putting n=1 in above equation
d=a
2
−a
1
=10.5−10=0.5
hence common difference for this A.P is d=0.5
the nth term of an A.P is given by.
a
n
=a
1
+(n−1)d
⟹a
n
=10+(n−1)(0.5)
⟹a
n
=10+0.5n−0.5
⟹a
n
=9.5+0.5n...eq(1)
for finding 11th term (a
11
)of this A.P put n=11 in above eq(1)
⟹a
11
=9.5+0.5×11
⟹a
11
=9.5+5.5
⟹a
11
=15.0
Explanation: mark me as the brainiest ans
Answered by
0
Answer:
a=-15, b=-10
d=b-a=-10 -(-15)
d=5
Explanation:
a15=a+(n-1) d ,a15=-15+(15-1)5 ,a15=-15+70=55
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