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Asked by Rawinder Last Modified
Answer 
Tasneem
(i)a = 7
l = 84
22 = n − 1
n = 23
On substituting the values, we get
(ii) a = 34
d = a2 − a1 = 32 − 34 = −2
l = 10
Let 10 be the nth term of this A.P.
10 = 34 + (n − 1) (−2)
−24 = (n − 1) (−2)
12 = n − 1
n = 13
(iii)
a = −5
l = −230
d = a2 − a1 = (−8) − (−5)
= − 8 + 5 = −3
Let −230 be the nth term of this A.P.
−230 = − 5 + (n − 1) (−3)
−225 = (n − 1) (−3)
(n − 1) = 75
n = 76
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Mrinal Bhattacharya
Engineering college, Assistant Professor, teaches Mathematics & Physics for more than 17 years
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