The 7th term of an Ap is -1 and 16th term is 17, find a and d
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1
Step-by-step explanation:
d=2
a=-13
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Answered by
1
Answer:
a= -13
d= -2
Step-by-step explanation:
a7= -1
a+6d= -1 (Because An=a+(n-1)d)
a+1= -6d--------♡
a16=17
a+15d=17
a-17=15d--------☆
Subtract ♡ from ☆
a-17=15d
a+1= -6d
______
-18= -9d
-18/-9=d
d= 2
Substitute d= 2 in ♡
a+1=6(2)
a+1=12
a= 12-1
a= 11
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